Why Is Pressure Washing So Expensive?

If you’ve ever looked at quotes for pressure washing—whether for your patio, driveway, decking, or even external walls—you might have thought: “Why does it cost so much just to spray some water?”

On the surface, pressure washing looks simple: someone turns up with a machine, blasts water at the ground, and leaves. But the reality is far more complex, and that’s reflected in the price you pay.

In the UK, pressure washing typically costs between £3–£5 per m², or anywhere from £100 to £400+ per job depending on the surface and condition. Compared to DIY, these professional prices can feel steep.

So, why exactly is pressure washing so expensive? Let’s break it down.

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The True Cost of Professional Pressure Washing

Professional cleaning services aren’t just charging for water and electricity—they’re covering equipment, transport, labour, insurance, and expertise.

Here’s a look at what’s behind the bill you receive:

💡 Key takeaway: You’re not just paying for water—you’re paying for the whole infrastructure needed to deliver the service safely and professionally.

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Equipment Costs: Why Commercial Machines Aren’t Cheap

Most homeowners who buy a domestic pressure washer spend £100–£300 at a DIY shop. These are fine for cleaning cars or a small patio, but they lack the power and durability needed for professional work.

Professional contractors often use:

• Petrol-powered washers (far stronger than electric models).

• Hot water washers (great for grease and oil removal).

• Surface cleaners (rotary tools that cover wide areas evenly).

• Industrial lances and nozzles for different surfaces.

These machines can cost £1,000–£4,000 each. Add in water tanks, hoses, and accessories, and a contractor might invest £10,000+ in equipment.

When you hire a professional, part of what you’re paying for is access to this high-end kit.

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Labour Costs: Time, Skill, and Effort

Another reason pressure washing feels expensive is labour. In the UK, labour costs are a major factor in any trade.

• Most professional cleaners earn between £15–£25 per hour.

• Skilled contractors who specialise in exterior cleaning may charge more.

• Jobs usually require two workers (one to handle equipment, another for setup/safety).

How long does it take?

• Small patio (20m²) → 1–2 hours.

• Medium driveway (40m²) → 2–4 hours.

• Large driveway/patio (60m²+) → half a day or more.

Add extra time for re-sanding, sealing, or stain treatment, and a half-day job quickly becomes a full day.

Example: A two-person team working 5 hours at £20/hour each = £200 labour before fuel, equipment, and insurance costs are even considered.

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Insurance and Risk: Covering The “What Ifs”

High-pressure water can cause serious damage if used incorrectly. Professionals need insurance to cover risks such as:

• Breaking fragile paving stones.

• Damaging pointing or grouting.

• Shattering windows with accidental overspray.

• Causing slip hazards if surfaces aren’t finished properly.

Liability insurance for exterior cleaning businesses typically costs £300–£600 per year. This cost is spread across all jobs.

It may not sound like much, but it’s one of the factors that separates a professional from a “man with a van” who offers ultra-cheap but risky cleaning.

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Travel, Setup, and Hidden Time

Another overlooked reason for high costs is time spent outside the actual job.

• Travel: Contractors may drive 30–60 minutes each way.

• Setup: Unloading equipment, running hoses, connecting water supplies.

• Cleanup: Packing equipment, sweeping, and disposing of waste.

A “2-hour clean” might actually take 4–5 hours of total work, once travel and setup are included. Professionals must factor this into their pricing.

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Regional Price Differences in the UK

Like most trades, pressure washing costs vary by region.

So if you’re in central London, don’t be surprised if you’re quoted £300+ for a driveway that might cost £180 in Manchester.

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Extras That Push Prices Up

Pressure washing is rarely just blasting with water. Many surfaces require extra steps that add to the bill.

When you see a quote, always check whether these extras are included or charged separately.

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DIY vs Professional: Is It Really Cheaper to Do It Yourself?

One way homeowners try to save money is by doing the job themselves. Let’s compare.

DIY Costs

• Hire a pressure washer: £30–£50/day.

• Buy a pressure washer: £100–£400.

• Cleaning solutions: £10–£30.

• Your time: 3–6 hours for an average patio.

Professional Costs

• Small patio (20m²): £100–£150.

• Medium driveway (40m²): £150–£250.

• Large patio/driveway (60m²+): £250–£400+.

💡 Conclusion: DIY can be cheaper for one-off small jobs, but for larger or delicate patios, professionals deliver better results and reduce risk.

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Why Pressure Washing Is About Value, Not Just Price

When you see a price of £200–£300 for pressure washing, it’s easy to think it’s overpriced. But consider what you’re getting:

• Extended patio/driveway life: Regular cleaning prevents moss, algae, and staining that can shorten lifespan.

• Safety: A clean surface is less slippery and safer for family and visitors.

• Curb appeal: A sparkling driveway can add value if you’re selling your home.

• Time saving: Instead of spending your weekend struggling with a DIY washer, the job is done in hours.

If you divide the cost across the 1–2 years of enjoyment before your next clean, the price doesn’t look so bad.

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How to Avoid Overpaying

Even though pressure washing has genuine costs, you don’t want to be ripped off. Here are tips to get the best value:

1. Get 2–3 quotes – Compare services, not just prices.

2. Check reviews – Trustpilot, Checkatrade, or Google listings.

3. Ask what’s included – Re-sanding, sealing, and chemicals often cost extra.

4. Book off-peak – Many firms are busiest in spring; autumn/winter jobs may be cheaper.

5. Bundle services – Cleaning patio + driveway together is often cheaper per m².

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Summary: Why Pressure Washing Is Expensive

So, why does pressure washing seem expensive?

• High equipment costs (machines worth thousands of pounds).

• Labour costs (skilled workers at £15–£25/hour).

• Insurance and business overheads.

• Travel, setup, and hidden time.

• Extras like sealing, re-sanding, and stain treatment.

The average UK homeowner pays £3–£5 per m², or £150–£300 for an average patio or driveway. While that might seem steep, it reflects the real-world costs of running a professional service.

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✅ Key takeaway: Pressure washing isn’t just spraying water—it’s a skilled service with real overheads. You’re not just paying for clean paving, you’re paying for peace of mind, safety, and long-lasting results.

Seasonal Demand and Its Effect on Prices

Pressure washing companies often experience strong seasonal peaks. In the UK, the busiest months are March through July, when people prepare their gardens and outdoor spaces for spring and summer. During this time:

• Contractors may be fully booked weeks in advance.

• Prices are rarely discounted because demand is high.

• Urgent jobs sometimes attract a premium.

By contrast, in autumn and winter, demand slows. Some firms drop their rates to keep crews busy, so you may find cleaning services for 10–20% less outside peak season.

If you want to save money, booking in autumn is often smart—your patio will be clean and ready to enjoy in spring.

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The Environmental Factor

Pressure washing isn’t just about water—it’s about how that water (and any chemicals used) impacts the environment. Responsible contractors factor in:

• Water usage – Commercial machines can use 10–15 litres per minute, which adds to costs.

• Biodegradable cleaners – Eco-friendly solutions are more expensive than bleach or acid-based products.

• Wastewater disposal – Some areas require compliance with local drainage regulations.

This all contributes to the final price. Cheap providers might cut corners with harsh chemicals, but a reputable company will invest in safer products and proper waste management.

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Specialised Surfaces Require Extra Care

Not all patios, driveways, or walls can be blasted at maximum pressure. Some surfaces require more delicate, skilled handling:

These surfaces take more time, skill, and sometimes specialist chemicals. That’s part of why quotes vary so much from job to job.

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Safety and Compliance

Working with high-pressure water involves real safety risks. A professional cleaner isn’t just blasting dirt; they’re trained to avoid hazards such as:

• High-pressure injuries (jetting water can pierce skin).

• Slips and falls on wet surfaces.

• Electrical risks if water meets outdoor sockets.

• Damage to property if wrong pressure is applied.

To manage this safely, companies invest in:

• PPE (boots, gloves, goggles, ear protection).

• Training courses (some contractors hold City & Guilds or similar qualifications).

• Method statements and risk assessments for larger jobs.

These safety measures aren’t free, but they help explain why professional services are pricier than DIY attempts.

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The Value of Long-Term Protection

While pressure washing can look expensive up front, it can save homeowners money in the long run. Consider:

• Replacing a stained or moss-covered patio can cost £1,500–£3,000.

• A new driveway might cost £3,000–£7,000, depending on size and material.

• Regular cleaning and sealing every 1–2 years can double the lifespan of these surfaces.

When viewed as a preventative investment, pressure washing seems far less expensive.

If you’ve ever looked out at your garden and thought your patio looked a bit worse for wear, you’re not alone. Over time, patios accumulate dirt, moss, algae, weeds, and stains. A proper power wash (also known as pressure washing or jet washing) can transform it, making your garden space look fresh and welcoming again.

But if you’re not planning on doing it yourself, you’ll probably want to know: how much does it cost to power wash a patio in the UK?

The answer isn’t entirely straightforward, as costs depend on a range of factors—patio size, condition, type of surface, and even where you live. In this guide, we’ll break it all down, so you know exactly what to expect and how to budget for the job.

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Average Cost to Power Wash a Patio in the UK

On average, most homeowners in the UK can expect to pay £100–£350 for professional patio cleaning. The cost is usually calculated per square metre or per job, depending on the contractor.

Here’s a quick look at the typical prices:

💡 Key takeaway: For most average-sized UK patios, expect to spend somewhere around £150–£250.

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How Professionals Calculate Costs

There are three main pricing methods that patio cleaning companies use:

1. Per Square Metre Pricing

   • Most common in urban areas and for regular domestic work.

   • Prices typically range from £3–£5 per m² depending on the surface type and cleaning complexity.

2. Hourly Rates

   • Some contractors prefer to charge by the hour.

   • Typical rates are £30–£50 per hour, and a medium-sized patio usually takes 2–4 hours.

3. Flat Job Rate

   • Especially common for smaller patios or standard jobs.

   • You’ll get a single figure quote upfront (e.g., £180 for the whole job).

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Factors That Influence the Cost

Several variables affect how much you’ll pay. Here’s what matters most:

1. Size of the Patio

• Unsurprisingly, the bigger the patio, the more you’ll pay.

• Contractors often bring industrial-grade pressure washers that cover ground quickly, but larger areas still add labour time and water usage.

2. Type of Surface

Different surfaces require different cleaning techniques and pressures.

3. Condition of the Patio

• Light dirt/algae → Quicker and cheaper.

• Heavy moss, weeds, or oil stains → Longer cleaning time, possibly with chemical treatments, pushing up the price.

4. Location

• Prices vary across the UK.

  • London & South East: Expect to pay on the higher end (£4–£5 per m²).

  • North of England, Wales, Scotland: Slightly cheaper (£3–£4 per m²).

5. Extras

Many contractors offer additional services alongside power washing.

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DIY vs Professional Patio Cleaning

You might wonder: why not just hire or buy a pressure washer and do it myself?

DIY Costs

• Pressure washer purchase: £100–£400 (depending on brand and power).

• Hire a pressure washer: £30–£50 per day.

• Cleaning products: £10–£30.

• Your time: 3–6 hours for an average patio.

Pros of DIY

• Cheaper if you already own the equipment.

• You can do it at your own pace.

• Satisfaction of seeing instant results from your own effort.

Cons of DIY

• Domestic power washers aren’t always powerful enough for heavy moss or ingrained dirt.

• Risk of damaging delicate surfaces if you don’t know the right pressure.

• More effort, especially if the patio is large.

• You may skip finishing touches like re-sanding or sealing, which professionals usually include.

Bottom line: DIY patio cleaning could cost you as little as £40–£70 if you rent equipment, but the results may not match professional standards.

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Case Studies: Real-World Costs

Here are some realistic examples of what homeowners in the UK might expect to pay.

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How Often Should You Power Wash a Patio?

Most UK homeowners get their patios professionally cleaned once every 1–2 years.

• High-traffic patios (e.g., frequently used or shaded areas with lots of moss/algae growth) may need yearly cleaning.

• Low-maintenance patios (e.g., sunny spots with good drainage) may only need cleaning every 2–3 years.

Regular sweeping and light cleaning can help extend the time between professional washes.

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Tips for Saving Money

1. Get multiple quotes – Prices vary widely between contractors. Always get at least 2–3.

2. Book off-peak – Many companies are busiest in spring/summer. You may find lower prices in autumn/winter.

3. Bundle services – Some offer discounts if you also get your driveway, decking, or gutters cleaned at the same time.

4. Maintain between cleans – Regular brushing and weed control means less build-up, making future professional cleans cheaper.

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Red Flags When Hiring a Contractor

Not all patio cleaning companies are equal. Watch out for:

• Very low prices (e.g., “£50 for any patio”) – may indicate poor equipment or unskilled labour.

• No insurance – accidental damage could cost you.

• Lack of reviews or references – always check Google, Trustpilot, or Checkatrade.

• Cash-only demands – less professional and harder to track if issues arise.

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Environmental Considerations

Power washing uses a lot of water, and sometimes chemicals. If you’re eco-conscious:

• Ask your contractor if they use biodegradable cleaning solutions.

• Consider sealing your patio afterwards to reduce future build-up.

• For DIY, avoid harsh bleach or acid-based cleaners that can harm plants and pets.

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Quick Comparison: Costs at a Glance

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Final Thoughts

So, how much should it cost to power wash a patio in the UK?

For most homeowners:

• A small patio will cost around £100–£150.

• A medium patio will cost £150–£250.

• A large patio may set you back £250–£350+.

Add-ons like re-sanding, sealing, or weed removal will push up the total, but they also add value by protecting your patio long-term.

If you’re on a budget, DIY is an option, but for speed, efficiency, and long-lasting results, a professional clean is often worth the money.

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✅ Key takeaway: Budget around £3–£5 per m² for professional patio power washing in the UK.

Regional Cost Variations Across the UK

Where you live can significantly impact how much you pay.

• London & South East – Higher labour and business costs push prices to the top end (closer to £5 per m²).

• Midlands – Average rates around £3.50–£4 per m².

• North of England – Slightly cheaper, often £3–£3.50 per m².

• Scotland, Wales & Northern Ireland – Generally competitive rates, sometimes under £3 per m² in smaller towns.

If you live in a rural area, you might find fewer companies to choose from, but prices can be lower due to less overhead.

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Common Patio Problems Power Washing Can Solve

A patio clean isn’t just about aesthetics—it can tackle real maintenance issues:

1. Moss & Algae Growth

   • Slippery surfaces can be a safety hazard. Power washing removes this buildup.

2. Weeds in Joints

   • Especially in block paving, weeds make patios look untidy. Cleaning dislodges them, and re-sanding helps keep them away.

3. Oil & Grease Stains

   • BBQs, cars, and garden tools can leave stains. Professionals often use degreasers before pressure washing.

4. Weathering & Discolouration

   • Natural stone and concrete darken over time. Cleaning restores original colours.

5. Lichen Spots

   • Tough white or black spots (sometimes called “black spot algae”) are common on patios. These need specialised treatments, often included by pros.

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Choosing the Right Patio Cleaning Company

With so many options, it’s worth knowing what to look for before hiring. Here’s a checklist:

• ✅ Check reviews on Google, Trustpilot, or Checkatrade.

• ✅ Ask for a detailed quote (including extras like re-sanding or sealing).

• ✅ Verify insurance – damage can happen if high pressure is used incorrectly.

• ✅ Compare equipment – commercial pressure washers are far superior to DIY models.

• ✅ Confirm waste disposal – ask if they responsibly deal with dirty water and debris.

A reputable company should happily answer questions and provide references if asked.

Few things make a patio look as neglected as a coating of slimy green algae. Common across the UK, algae thrives in damp and shaded areas, especially during our wet winters. Left unchecked, it not only makes patio slabs look dirty and old but also creates a slippery surface that can be a real hazard.

The good news is, there are plenty of effective ways to remove green algae and restore your patio slabs to their former glory. Whether you want to use eco-friendly methods, shop-bought patio cleaners, or hire professional help, this guide covers everything you need to know.

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Why Does Algae Grow on Patio Slabs?

Green algae is a simple plant-like organism that thrives in moist, shaded, and nutrient-rich environments. Your patio provides the perfect conditions, especially if:

• It’s shaded by trees, walls, or fences.

• Rainwater doesn’t drain properly, leaving puddles.

• Fallen leaves or soil sit on the slabs, feeding the algae.

• There’s little sunlight or airflow to keep surfaces dry.

Because of the UK’s rainy climate, algae is a widespread problem, particularly between October and April.

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Step 1: Preparation Before Cleaning

Before tackling algae removal:

1. Move furniture, pots, and ornaments.

2. Sweep away loose leaves and debris with a stiff broom.

3. If weeds are growing between the slabs, pull them out.

This ensures you can focus on removing the algae itself.

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Step 2: Cleaning Methods for Removing Green Algae

There are several ways to remove algae, ranging from natural home remedies to professional-grade cleaning. Each has its pros, cons, and costs.

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1. Warm Soapy Water and a Brush

This is the simplest and cheapest option.

How to do it:

• Mix hot water with washing-up liquid.

• Pour onto the affected slabs.

• Scrub with a stiff yard brush.

• Rinse with clean water.

Pros: Cheap, eco-friendly, safe for all stones.
Cons: Labour-intensive, less effective on heavy growth.

Cost: Under £5.

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2. White Vinegar Solution

Vinegar is mildly acidic and works well on algae.

How to do it:

• Mix vinegar and water in equal parts.

• Pour or spray onto algae patches.

• Leave for 20–30 minutes.

• Scrub and rinse thoroughly.

Pros: Natural and pet-friendly (once rinsed).
Cons: Avoid on limestone or marble (acid-sensitive).

Cost: £2–£3 per litre.

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3. Bleach Solution

Bleach is a powerful disinfectant that kills algae quickly.

How to do it:

• Mix 1 part household bleach with 10 parts water.

• Apply with a watering can or sprayer.

• Leave for 10–15 minutes.

• Scrub and rinse well.

Pros: Fast and effective.
Cons: Can harm plants, lawns, and may discolour stone.

Cost: Around £1–£2 per litre.

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4. Specialist Patio Cleaners

Many UK garden centres and DIY stores sell products designed for algae and moss removal. These are often biocidal, meaning they kill the spores as well as surface growth.

How to do it:

• Dilute as per instructions.

• Apply using a watering can or pump sprayer.

• Leave to work — some don’t require scrubbing.

• Rinse or allow rain to wash away residue.

Pros: Long-lasting protection, tailored formulas.
Cons: Costs more, some contain chemicals unsuitable for delicate stone.

Cost: £10–£25 for 5 litres (covers 20–40 m²).

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5. Pressure Washing

A pressure washer blasts algae away with high-pressure water.

How to do it:

• Use a wide spray nozzle.

• Keep nozzle 20–30 cm from surface.

• Move in even sweeps to avoid striping.

Pros: Very effective, fast results.
Cons: Can damage pointing or soft stones like sandstone.

Cost:

• Buy domestic washer: £100–£150.

• Hire for a day: around £40.

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Comparison Table: Algae Removal Methods

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Step 3: Preventing Algae Returning

Cleaning is only half the battle. To keep your patio looking new:

• Improve drainage – ensure water doesn’t pool on slabs.

• Increase sunlight – trim back overhanging branches or hedges.

• Sweep regularly – remove leaves and dirt before they feed algae.

• Apply a sealant – protective coatings help stop algae regrowth.

• Use a biocidal wash annually – prevents spores from taking hold.

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Step 4: Sealing Your Patio

Applying a patio sealant creates a barrier against moisture and algae.

Benefits:

• Reduces algae and moss regrowth.

• Protects porous stone from staining.

• Enhances colour (natural or wet-look finish).

Types:

• Penetrating sealers: Soak into stone for invisible protection.

• Surface sealers: Create a visible layer with sheen.

Cost: £25–£40 for 5 litres (covers 25–50 m²).

Reapply every 2–3 years for best results.

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Step 5: Professional vs DIY Algae Removal

If your patio is large or badly affected, hiring a professional may be worthwhile.

For a 30 m² patio:

• DIY with cleaners: under £25.

• Professional clean & seal: £240–£360.

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Eco-Friendly Algae Removal

Many homeowners prefer avoiding chemicals for environmental or safety reasons. Options include:

• Vinegar solution.

• Baking soda scrub for small patches.

• Boiling water for cracks and joints.

• Eco-labelled patio cleaners (biodegradable formulas, £15–£20).

• Low-pressure steam cleaning (used by some professionals).

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Material-Specific Algae Cleaning

Different stone types need different care.

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Common Mistakes to Avoid

• Using bleach near plants without protection.

• Applying vinegar or acid cleaners to limestone or marble.

• Jet washing too close, damaging slabs and pointing.

• Forgetting to rinse, leaving slippery residues.

• Not sealing after cleaning, leading to rapid regrowth.

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Safety Tips for Algae Removal

• Wear gloves and eye protection when handling chemicals.

• Keep pets and children away until the patio is rinsed and dry.

• Cover plants with tarpaulin or plastic sheeting.

• Don’t mix cleaners (e.g. bleach + vinegar = toxic fumes).

• Be cautious on wet, slippery slabs during cleaning.

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Seasonal Patio Care

Algae tends to return during certain times of year. A seasonal approach helps:

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When to Call a Professional

DIY cleaning is often enough, but professional help is best if:

• Your patio is very large or heavily covered in algae.

• Slabs are delicate or expensive stone.

• You want sealing applied for long-term results.

• You’d prefer not to handle chemicals yourself.

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Final Thoughts

Green algae on patio slabs may look unsightly and create a slip hazard, but it’s not permanent. With the right cleaning method — whether that’s soapy water, vinegar, bleach, specialist patio cleaners, or a pressure washer — you can bring your patio back to life.

For lasting results, remember to:

• Seal the slabs.

• Maintain drainage and airflow.

• Clean regularly before algae takes hold.

With just a weekend’s effort (and less than £30 in materials for DIY cleaning), you can transform your patio into a safe, clean, and attractive outdoor space again.

Natural Weed and Algae Prevention

While cleaning removes algae, prevention is just as important. Homeowners can use natural methods to discourage regrowth:

• Boiling water – pour into cracks and joints to kill spores and weeds.

• Regular sweeping – keeps leaves and soil from feeding algae.

• Sand in joints – brushing kiln-dried sand between slabs reduces moisture collection.

• Move pots and furniture – avoids permanent damp patches where algae thrives.

These low-cost measures make future cleans quicker and easier.

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Budget vs Premium Algae Cleaners

Is it worth paying extra for a premium cleaner, or do budget products work just as well?

If you’re only giving your patio a yearly clean, budget options are fine. For ongoing protection or valuable stone (like sandstone or limestone), premium products usually pay off.

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Tools Every Homeowner Should Own

A few reliable tools make algae removal much easier:

• Stiff yard brush (£10–£15) – for scrubbing.

• Pump sprayer (£10–£20) – for even application of cleaners.

• Domestic pressure washer (£100–£150) – for occasional deep cleans.

• Hand weeding tool (£5–£10) – to clear joints before sealing.

• Protective gloves and goggles (£10–£15) – essential for chemical handling.

These tools are a one-time investment but can save hundreds compared to hiring professionals every year.

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Safety Checklist for Algae Cleaning

Patio cleaning often involves slippery surfaces, water, and chemicals. Stay safe with this checklist:

• Wear sturdy gloves and safety goggles.

• Keep children and pets away during cleaning.

• Cover plants with tarpaulin if using bleach or chemicals.

• Rinse thoroughly to remove residues before walking on slabs.

• Never mix cleaning products (especially bleach and vinegar).

• Use caution with jet washers — high pressure can cause injuries.

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Long-Term Patio Upgrades

If algae keeps coming back or slabs are badly stained, you may want to consider upgrades:

• Repointing – replace jointing sand or mortar for sharper looks.

• Replacing slabs – swap heavily stained or cracked ones.

• Installing edging stones – reduces soil run-off and keeps joints cleaner.

• Resurfacing – resin-bound gravel or outdoor tiles can give a modern, algae-resistant finish.

• Adding lighting – not only looks good, but extra light also discourages algae in shaded areas.

Your patio is one of the most-used areas in your garden. From hosting barbecues in summer to simply sitting outdoors with a cup of tea, it’s a space that brings people together. But over time, dirt, moss, algae, weeds, and stains can make even the best-laid patio look tired and neglected.

The good news? With the right approach, you can transform a dirty patio back into a fresh, inviting outdoor space. In this blog, we’ll cover everything you need to know about cleaning a patio in the UK — from quick fixes to deep cleans, eco-friendly approaches, and when it might be worth hiring a professional.

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Why Do Patios Get So Dirty?

The UK’s damp and unpredictable weather means patios face several challenges:

• Moisture: Regular rain encourages moss, algae, and lichen growth.

• Shade: Slabs under trees or near fences stay damp for longer.

• Wind: Blows dust, pollen, and soil onto the surface.

• Leaves and plants: Can stain and block drainage when left to rot.

• Foot traffic and pets: Track in mud and grime.

• Barbecues and outdoor dining: Leave behind grease, oil, and food stains.

Understanding these factors helps you choose the best cleaning method for your own patio.

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Step 1: Preparation

Before any deep cleaning, do a bit of preparation:

1. Remove furniture, pots, and ornaments.

2. Sweep the area with a stiff brush to get rid of loose debris.

3. Pull out any large weeds from between slabs.

This makes the cleaning process easier and prevents dirt spreading around again.

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Step 2: Choose Your Cleaning Method

There’s no single “right” way to clean a patio. The best method depends on how dirty your slabs are, the material they’re made of, and your budget. Below are the most common techniques.

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1. Pressure Washing

Pressure washing is one of the most popular and effective ways to clean a patio.

How it works:

• A jet of water blasts away dirt, algae, moss, and grime.

• A rotary surface cleaner attachment helps give even results.

Pros:

• Quick and powerful.

• Restores heavily soiled patios.

• No need for strong chemicals.

Cons:

• Can damage pointing (the sand or mortar between slabs).

• Too much pressure can harm softer stones like sandstone or limestone.

Cost:

• £100–£150 to buy a decent domestic machine.

• Around £40 per day to hire one.

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2. Soapy Water and a Stiff Brush

The old-fashioned method still works well for lightly dirty patios.

How it works:

• Mix hot water with washing-up liquid.

• Pour onto the slabs.

• Scrub with a stiff broom or yard brush.

• Rinse with clean water.

Pros:

• Cheap and safe for all patio types.

• Eco-friendly compared to harsh chemicals.

Cons:

• Labour intensive.

• Less effective on deep stains or heavy moss.

Cost: Less than £5.

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3. Specialist Patio Cleaners

Professionals and homeowners often use chemical patio cleaners for tougher jobs.

Types include:

• Biocidal cleaners: Kill algae, moss, and lichen spores to prevent regrowth.

• Alkaline cleaners: Cut through greasy stains.

• Acid-based cleaners: Tackle rust and efflorescence (white salt marks).

Pros:

• Long-lasting results.

• Targeted formulas for specific problems.

Cons:

• Some contain strong chemicals.

• Not all are safe for plants or pets.

• Acid-based cleaners must be avoided on limestone or marble.

Cost: £10–£25 for 5 litres (covers 20–40 m²).

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4. Natural and Homemade Cleaners

Many homeowners prefer natural solutions:

• White vinegar: Effective against algae. Mix 1:1 with water, apply, leave for 30 minutes, scrub, and rinse. Avoid on limestone.

• Baking soda: Great for oily stains. Sprinkle, scrub, rinse.

• Bleach: Use diluted (1:10 with water) to kill moss and mould. Use cautiously as it may harm plants.

Pros:

• Cheap and widely available.

• Gentle options available for eco-conscious cleaning.

Cons:

• May need repeating for stubborn dirt.

• Can damage sensitive stone.

Cost: Under £5.

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Comparison Table: Patio Cleaning Methods

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Step 3: Tackle Specific Problems

Sometimes, a general clean isn’t enough. Here’s how to deal with common issues:

Moss and Weeds

• Remove manually or with a wire brush.

• Apply a weed killer or biocidal cleaner.

• Refill joints with kiln-dried sand to discourage regrowth.

Algae and Green Slime

• Use diluted bleach or a patio cleaner.

• Improve drainage and sunlight exposure to prevent return.

Oil and Grease Stains

• Blot with cat litter or baking soda.

• Scrub with soapy water.

Rust Stains

• Use a specialist rust remover (£12–£15).

• Test on a hidden patch first.

White Bloom (Efflorescence)

• Caused by salts rising from slabs.

• Often fades naturally but acid-based cleaners can speed up removal (not for limestone).

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Step 4: Seal Your Patio

Once clean, applying a sealant keeps your slabs looking good for longer.

Benefits:

• Repels water and oil.

• Slows moss and algae growth.

• Protects porous stone from staining.

Types of Sealants:

• Penetrating sealers: Soak into the stone for invisible protection.

• Surface sealers: Leave a sheen, sometimes glossy (“wet look”).

Cost: £25–£40 for 5 litres (covers 25–50 m²).

Sealants typically last 2–3 years before reapplication is needed.

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Cost Breakdown: DIY vs Professional

Cleaning a patio yourself is cheaper, but can be time-consuming. Professionals often bring commercial-grade machines and cleaning products.

For a 30 m² patio, a professional clean and seal might cost £240–£360. Doing it yourself with hired equipment and cleaners could cost under £80.

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Step 5: Ongoing Maintenance

Once your patio is spotless, a little regular care will keep it that way:

• Sweep weekly to prevent dirt build-up.

• Move pots occasionally to avoid staining.

• Rinse after barbecues to prevent grease stains.

• Apply patio cleaner once or twice a year.

• Reseal every few years.

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Eco-Friendly Patio Cleaning

If you want to avoid harsh chemicals, here are greener approaches:

• Use vinegar and baking soda for stains.

• Try biodegradable patio cleaners (around £15–£20).

• Use boiling water for weeds instead of herbicides.

• Avoid bleach near flowerbeds and lawns.

These options may require more frequent cleaning but are better for wildlife and soil health.

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Material-Specific Patio Cleaning Tips

Not all slabs are the same. Different stones need tailored care.

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Mistakes to Avoid

Many patios get damaged because of common cleaning mistakes:

• Overusing bleach: Can damage slabs and nearby plants.

• Too much jet wash pressure: Risks chipping stone and loosening joints.

• Not rinsing properly: Leaves soapy residue that attracts dirt.

• Skipping sealing: Leaves slabs vulnerable to quick regrowth of algae.

• Using the wrong cleaner: Acid on limestone can cause permanent damage.

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When to Call a Professional

DIY works for most situations, but it might be worth calling in a pro if:

• Your patio is very large.

• Slabs are badly stained or covered in lichen.

• You have valuable or delicate stone.

• You don’t own or want to hire equipment.

• You want sealing applied for long-term protection.

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Final Thoughts

A dirty patio doesn’t mean you need a full replacement. With the right approach, your slabs can look fresh and inviting again.

• For light cleaning, soapy water and a brush will do the trick.

• For heavy grime, pressure washing or specialist cleaners make a huge difference.

• Always seal for longer-lasting results.

• Don’t forget regular maintenance to keep your patio at its best.

Whether you prefer eco-friendly DIY methods or the power of professional cleaning, restoring your patio can be a weekend project that makes your entire garden feel brand new.

Seasonal Patio Cleaning Schedule

Patios face different challenges throughout the year in the UK. A seasonal plan makes upkeep much easier.

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Tools Every Homeowner Should Have

You don’t need professional equipment to keep a patio tidy, but a few reliable tools make a huge difference:

• Stiff yard brush (£10–£15) – for sweeping and scrubbing.

• Pump sprayer (£10–£20) – to apply cleaners evenly.

• Pressure washer (domestic) (£100–£150) – for occasional deep cleaning.

• Kneeling pad & weeding tool (£5–£10) – for joints and edges.

• Protective gloves & goggles (£10–£15) – for safe chemical handling.

Investing once in these basics will save money and effort in the long run.

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Natural Weed Control Methods

Weeds between patio slabs are a constant frustration, but you don’t always need chemical sprays:

• Boiling water: Pour directly into cracks to kill weeds.

• Vinegar spray: Use diluted vinegar (avoid plants nearby).

• Salt solution: Effective but should be used sparingly to avoid soil damage.

• Re-sanding: Brush kiln-dried sand into gaps to block regrowth.

• Flame or infrared weed burners: A fast, chemical-free method (from £20).

These natural approaches are safe for pets and children and kinder to the environment.

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Budget vs Premium Patio Products

Is it worth spending more on cleaning solutions and sealants?

If you clean once a year, budget products are fine. For heavy-use patios or delicate stone, premium products are usually worth it.

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Safety Tips for Patio Cleaning

It’s easy to underestimate the risks of patio cleaning. Keep these in mind:

• Wear gloves and goggles when using chemicals.

• Test cleaners on a small hidden patch first.

• Check pressure washer settings before starting.

• Avoid mixing chemicals (e.g. bleach and vinegar).

• Be cautious of slippery surfaces when rinsing.

• Protect nearby plants with plastic sheeting.

Safety first ensures both you and your patio stay in good condition.

If you’ve ever admired a freshly cleaned patio and wondered how the professionals achieve such spotless results, you’re not alone. Patio slabs can quickly become dull and dirty thanks to the UK’s damp climate, fallen leaves, weeds, algae, moss, and everyday wear and tear. While DIY cleaning methods (like warm soapy water or vinegar) can help, professionals often use specialist tools and products to restore slabs to a nearly new finish.

In this guide, we’ll explore what professionals use to clean patio slabs, the methods behind their impressive results, and how you can decide whether to invest in similar products or hire an expert.

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Why Hire a Professional?

Before diving into the kit itself, let’s look at why people often turn to a pro:

• Expertise: They know which products suit each type of stone (sandstone, limestone, concrete, porcelain, granite).

• Specialist equipment: Tools like commercial pressure washers and rotary surface cleaners are far more powerful than standard consumer versions.

• Time saving: A pro can complete a large patio in a fraction of the time.

• Long-lasting results: Professional-grade sealants and cleaners often give protection for months or even years.

• Less risk: Using the wrong cleaner on limestone, for example, can cause permanent damage.

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The Professional Cleaning Arsenal

Professional patio cleaners don’t just show up with a power washer and soap. They use a carefully selected set of products and machines.

1. Commercial Pressure Washers

Unlike the consumer models sold in DIY shops, professionals often use heavy-duty pressure washers capable of 2,000–4,000 PSI (pounds per square inch). These machines deliver more consistent pressure and often connect to large water tanks for uninterrupted flow.

They also use rotary surface cleaners, which look like circular floor scrubbers. These allow even cleaning without striping or leaving patchy marks — a common problem when homeowners use a lance nozzle.

Why professionals like them:

• Deep cleans quickly.

• Even finish across slabs.

• Can be used on large areas efficiently.

Cost if you buy one: £400–£2,000 for professional-grade machines.

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2. Specialist Patio Cleaners (Chemicals)

Pros often carry several different cleaning solutions tailored to specific jobs:

• Biocidal cleaners: These target organic growth such as algae, lichen, and moss. Unlike bleach, they don’t just remove surface colouration but kill spores, slowing regrowth.

• Alkaline degreasers: Used on greasy stains from barbecues or food spills.

• Acid-based cleaners: Sometimes used (with caution) on tough stains like rust or efflorescence. Not suitable for limestone or marble.

• Eco-friendly cleaners: Increasingly popular for clients worried about pets, plants, or runoff.

Cost if you buy: Around £15–£30 per 5 litres for professional-grade formulas.

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3. Mechanical Scrubbing Tools

Sometimes pressure washing alone isn’t enough — especially on textured or porous stones. Professionals may use:

• Rotary scrubber machines (like those used on floors).

• Stiff brushes for working in cleaners.

• Wire brushes for weeds and stubborn lichen spots.

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4. Weed Removal Tools

Weeds between patio slabs are a persistent issue. Professionals often:

• Use weed burners (flame or infrared heat tools) to kill weeds quickly.

• Apply a targeted herbicide to prevent regrowth.

• Refill joints with kiln-dried sand or resin-based jointing compound after cleaning.

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5. Professional Sealants

After cleaning, many professionals recommend sealing the patio. Sealants provide:

• Protection against water penetration.

• Resistance to staining (oil, wine, barbecue grease).

• Reduced algae and moss regrowth.

• A refreshed colour and finish (either natural matte or “wet look” gloss).

Cost if you buy: £30–£60 for 5 litres, covering around 25–40 m².

Application usually requires specialist sprayers or rollers to achieve an even coat.

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Comparison Table: Professional vs DIY Tools

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Step-by-Step: How Professionals Clean Patio Slabs

Here’s the general process a professional will follow:

1. Inspection

   • Identify slab material (sandstone, concrete, porcelain, etc.).

   • Check for damage, stains, or fragile pointing.

2. Preparation

   • Remove furniture, pots, and obstacles.

   • Sweep away debris.

   • Apply weed killer if needed.

3. Pre-treatment

   • Apply biocidal cleaner to kill moss, algae, or lichen.

   • For stains, apply a targeted degreaser or rust remover.

4. Mechanical Cleaning

   • Use a rotary surface cleaner attached to a high-pressure washer.

   • Work systematically for even coverage.

5. Detailing

   • Tackle stubborn spots manually with brushes or a lance.

   • Clean joints, edges, and corners.

6. Rinsing

   • Thorough rinse with clean water to remove residues.

7. Joint Re-sanding (if needed)

   • Replace kiln-dried sand between slabs.

8. Sealing (optional but recommended)

   • Apply protective sealant for longer-lasting results.

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What Does It Cost to Hire a Professional in the UK?

Prices vary by region, slab type, and patio size, but typical UK costs are:

For a 30 m² patio, a full clean and seal might cost around £240–£360.

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Why Professionals Don’t Always Use Bleach or Vinegar

Many homeowners reach for bleach or vinegar when tackling patio stains. While these can be effective for light cleaning, professionals often avoid them:

• Bleach: Can discolour stone, harm plants, and damage soil.

• Vinegar: Acidic, which can etch and damage limestone or marble.

Instead, pros use specially formulated cleaners that are safer for stone and often biodegradable, giving better long-term results.

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Eco-Friendly Options Used by Professionals

As more clients request environmentally responsible cleaning, professionals now offer eco-friendly services:

• Biodegradable detergents: Break down naturally without harming lawns or flowerbeds.

• Hot water pressure washing: Uses heat instead of chemicals to lift stains.

• Low-pressure steam cleaning: Gentle but effective on delicate stone.

• Organic herbicides: Plant-safe weed killers for joints.

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How Professionals Handle Different Patio Materials

Pros always test cleaners in a small area first to avoid damage.

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Tools Professionals Use That You Can Too

If you’re inspired to tackle your own patio, here are some pro-level tools worth investing in:

• Rotary surface cleaner attachment (£50–£150 for domestic use).

• Mid-range pressure washer (~£200–£300, 1800–2200 PSI).

• Biocidal patio cleaner (£15–£20 for 5 litres).

• Pump sprayer (£10–£20).

• Stiff broom + wire brush (£10–£15).

This setup could cost around £250–£350 — about the same as one professional deep clean for a medium patio, but reusable year after year.

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Mistakes Professionals Avoid (But Homeowners Often Make)

• Using too much pressure: Can damage slabs or pointing.

• Choosing the wrong chemical: Acid on limestone is a costly error.

• Skipping pre-treatment: Washing alone won’t kill spores; growth comes back quickly.

• Failing to rinse thoroughly: Leaves residue that attracts dirt.

• Not sealing: Without sealing, slabs get dirty again much faster.

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Long-Term Benefits of Professional Cleaning

Hiring a professional isn’t just about instant results. It also helps:

• Extend the lifespan of your slabs.

• Reduce slipping hazards from algae and moss.

• Improve kerb appeal and property value.

• Lower future cleaning costs (since sealed surfaces resist dirt).

Steam Cleaning vs Pressure Washing

Some professionals use steam cleaning instead of (or alongside) pressure washing. This method uses superheated water vapour at relatively low pressure.

Advantages:

• Gentle on delicate stone like limestone and sandstone.

• Kills moss, algae, and lichen spores without chemicals.

• Less risk of damaging pointing or mortar.

Disadvantages:

• Slower and more expensive.

• Requires specialised machines costing thousands of pounds.

Steam cleaning is often used for heritage sites or period properties where preservation is key.

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Training and Safety Standards Professionals Follow

Cleaning patios may sound straightforward, but professionals follow strict safety practices:

• COSHH compliance: Correct handling of chemicals under UK law.

• Protective equipment: Goggles, gloves, ear defenders, and steel-toe boots.

• Surface testing: Spot-testing cleaners on a hidden slab before full application.

• Water run-off management: Preventing chemical flow into drains or flowerbeds.

Hiring a professional means peace of mind that safety and regulations are being respected — something DIY jobs sometimes overlook.

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The Role of Sealants in Professional Work

For many professionals, cleaning is only half the job. Sealing is what makes results last:

• Penetrating sealers: Soak into the stone, protecting it from within. Best for natural stone.

• Topical sealers: Form a surface coating, enhancing colour and gloss. Better for concrete or porcelain.

• Breathable sealants: Allow moisture to escape while still protecting against stains.

Most sealants last 2–5 years, depending on foot traffic and exposure. Pros often recommend reapplication every 3 years for best results.

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Cost-Saving Tips if You Want Professional Results

Hiring a professional isn’t the only way to achieve high standards. You can save money by:

• Hiring equipment: Rotary cleaners and pressure washers can be rented for £40–£60 per day.

• Buying pro-grade cleaners: Many suppliers sell to homeowners online.

• Doing prep yourself: Move furniture, sweep, and pull weeds before the professional arrives to save time (and labour charges).

• Sealing yourself: Ask the pro to just clean, then apply the sealant DIY with a roller.

This hybrid approach can cut bills by 20–40%.

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Questions to Ask Before Hiring a Professional

If you decide to bring in a pro, it pays to ask a few key questions:

1. What equipment do you use? (Look for rotary cleaners, not just lance washing.)

2. Which cleaning solutions do you use, and are they safe for pets/plants?

3. Do you offer sealing after cleaning?

4. Can I see before-and-after photos of previous jobs?

5. Are you insured? (Public liability insurance is essential.)

This ensures you’re choosing a reputable provider rather than a “cowboy cleaner” with just a cheap pressure washer.

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Final Thoughts

So, what do professionals use to clean patio slabs? In short: commercial pressure washers, rotary surface cleaners, targeted chemical treatments, and high-quality sealants. These tools and products deliver results that last far longer than DIY methods — which is why patios look nearly new again after a professional visit.

If your patio is small and only lightly soiled, DIY methods might be enough. But for larger areas, stubborn stains, or delicate stone, investing in professional help (or professional-grade products) is usually the best way to restore your patio to its former glory.