Best Way to Clean a Patio: A Complete Guide

Table of Contents

• Know Your Surface Before You Clean Your Patio Concrete and Paving Slabs Natural Stone Block Paving
  

  • Concrete and Paving Slabs

  • Natural Stone

  • Block Paving

• Essential Tools and Cleaning Solutions Equipment: Pressure Washer, Brushes, and More Cleaning Products: Chemical vs Eco-Friendly Options
  

  • Equipment: Pressure Washer, Brushes, and More

  • Cleaning Products: Chemical vs Eco-Friendly Options

• Best Patio Cleaner for Algae and Biological Growth

• How to Remove Black Spots from Your Patio

• Pressure Washing Patio Tips: Step-by-Step Safety Gear and Pre-Clean Preparation The Cleaning Process Equipment Rental vs Purchase: Which Makes Sense?
  

  • Safety Gear and Pre-Clean Preparation

  • The Cleaning Process

  • Equipment Rental vs Purchase: Which Makes Sense?

• How to Seal Patio Slabs After Cleaning

• Post-Cleaning Maintenance Calendar

• When to Call a Professional to Clean Your Patio

Last Updated: August 20, 2026

The best way to clean a patio depends on your surface material and what's growing on it. Get it wrong and you risk stripping jointing sand, etching natural stone, or leaving streaks harder to remove than the original grime. This guide from Drive Revive Haddington walks through identifying your surface type, choosing the right cleaning products, and knowing when a professional clean is the smarter call.

Know Your Surface Before You Clean Your Patio

The single biggest mistake people make is treating every patio the same. Concrete paving slabs, natural stone, and block paving each have different levels of porosity, different sensitivities to pressure and chemicals, and different maintenance needs. Match your method to your material and you'll get a clean result without damage.

Concrete and Paving Slabs

Concrete and standard paving slabs handle higher pressure washing settings and tolerate a broader range of cleaning products, including alkaline degreasers. Efflorescence, the white powdery residue from mineral salts, responds well to diluted acidic cleaner applied before pressure washing.

The main risk is using a high-pressure nozzle too close to the surface, which pits the top layer. Keep the nozzle at least 30 centimetres from the surface and use a rotary patio cleaner attachment where possible.

Natural Stone

Natural stone, including sandstone, slate, and limestone, is porous and far more sensitive than concrete. Acidic cleaners will etch the surface permanently. Stick to pH-neutral cleaners designed for stone and keep pressure washing settings lower than for concrete. Avoid wire brushes entirely; use only stiff bristle brushes.

Algae growth is particularly aggressive on sandstone because moisture is retained in the pores. A dedicated biological cleaner applied before rinsing is often more effective than pressure alone.

Block Paving

Block paving joints are filled with kiln-dried jointing sand, and aggressive pressure washing blasts this sand out, allowing weeds to establish and blocks to shift. Use a rotary surface cleaner attachment, which distributes pressure evenly and reduces sand loss. After cleaning, replace any displaced jointing sand and compact it back into the joints.

Essential Tools and Cleaning Solutions

Getting the tools right saves time and protects your surfaces. You do not need an expensive setup for most patio cleaning jobs.

Equipment: Pressure Washer, Brushes, and More

A pressure washer is the most effective tool for deep cleaning, but it is not always essential. For light biological growth and general grime, a stiff bristle brush and good patio cleaner will do the job without risk of surface damage.

For larger areas or stubborn algae and moss, a pressure washer with adjustable pressure settings is practical. The Kärcher K5 Power Control operates at 2,103 PSI with adjustable settings and accepts a patio cleaner attachment, suitable for concrete and block paving. For natural stone, dial the pressure back and switch to a wider fan nozzle.

For manual cleaning, the Roughneck Paving and Patio Brush Set includes a weeding pointer scraper and carbon steel bristle brush. The Einhell PICOBELLA 18V cordless cleaning brush reduces physical effort without high-pressure damage risk to delicate surfaces.

Cleaning Products: Chemical vs Eco-Friendly Options

Product	Best For	Application	Notes
Algon Organic Path & Patio Cleaner	Moss, mould, algae	Apply and leave	Eco-friendly, safe for pets once dry
Patio Magic! Concentrate	General algae and green mould	Apply and leave	No scrubbing needed; needs dry weather
Jeyes Fluid Outdoor Cleaner	General cleaning and disinfection	Apply, scrub, rinse	Versatile; strong odour
StoneCare4U Black Spot Remover	Black lichen on porous stone	Apply, work in, rinse	Alkaline formula, safe for natural stone
Jarder Path and Patio Weed Killer	Weeds in joints and cracks	Spray directly	Fast-acting; safe once dry

Chemical cleaners work faster and produce more visible results. Eco-friendly options like Algon take longer but are safer around children, pets, and garden planting.

Pro Tip Apply any cleaning solution on a dry day with no rain forecast for at least four hours. Wet conditions dilute the product before it can work.

Best Patio Cleaner for Algae and Biological Growth

For light to moderate algae on concrete or brick, Patio Magic! Concentrate is practical: apply it, leave it, and let the formula work without scrubbing. It also contains a preventative element that slows regrowth.

For heavier biological growth on natural stone or shaded patios, Algon Organic Path and Patio Cleaner is worth the longer wait time. It is non-toxic, effective across many surfaces, and safe for wildlife once dry.

Jeyes Fluid is a solid all-rounder for patios needing both cleaning and disinfecting. It tackles mildew and algae while killing bacteria and can be diluted to different concentrations.

According to RHS guidance on patio and hard surface maintenance, removing biological growth promptly and sealing porous surfaces afterwards is the most effective long-term strategy for preventing algae regrowth.

How to Remove Black Spots from Your Patio

Black spots on patio surfaces are almost always black lichen, not dirt. Lichen embeds itself into porous paving, which is why standard cleaners and pressure washing often fail to shift it completely.

StoneCare4U Black Spot Remover is specifically formulated for this problem. It is an alkaline cleaner that penetrates the porous surface to break down lichen at the root. Apply the product, work it in with a stiff bristle brush, leave it for the recommended dwell time, then rinse thoroughly. It is safe for natural stone and concrete paving.

For very persistent black spots, a second treatment after 48 hours combined with pressure washing between applications typically produces a complete result.

Watch Out Do not use acid-based cleaners on natural stone in an attempt to shift black spots faster. Acidic products will etch the surface permanently, leaving dull patches impossible to restore without professional grinding or replacement.

Pressure Washing Patio Tips: Step-by-Step

Pressure washing is the fastest way to deep clean most patio surfaces, but results depend on preparation and technique.

Safety Gear and Pre-Clean Preparation

Pressure washing without appropriate protective equipment has real consequences. Water at high pressure carries debris at speed, and biological material like algae makes wet surfaces extremely slippery.

Before you start:

1. Put on safety goggles, waterproof gloves, and non-slip footwear

2. Clear the patio of all furniture, plant pots, and loose items

3. Sweep away loose debris, grit, and leaves with a stiff brush

4. Apply a patio cleaner or degreaser and allow the recommended dwell time

5. Cover any nearby drains if using chemical cleaning products

6. Wet any surrounding plants or grass to dilute chemical runoff

The Cleaning Process

1. Connect the pressure washer and select a wide fan nozzle or rotary patio cleaner attachment

2. Start at the highest point so dirty water runs away from already-cleaned areas

3. Hold the nozzle at least 30 centimetres from the surface; closer risks damage

4. Work in overlapping passes, moving steadily rather than lingering in one spot

5. For block paving, use only a rotary surface cleaner attachment to protect jointing sand

6. Rinse the entire surface with clean water once scrubbing is complete

7. Allow the surface to dry fully before applying any sealant

Pro Tip After pressure washing block paving, [brush kiln-dried jointing sand back into the joints](/post/why-re-sanding-block-paving-matters) before the surface is fully dry. This is far easier when the surface is still slightly damp.

Equipment Rental vs Purchase

Buying a pressure washer makes financial sense if you plan to use it at least three or four times per year. For a one-off deep clean, equipment hire is almost always cheaper and removes the storage problem.

Many tool hire companies offer daily pressure washer hire, giving access to commercial-grade machines at a fraction of the purchase price. For homeowners who want a machine they own, mid-range electric pressure washers with adjustable pressure settings and a patio cleaner attachment represent the best balance of capability and cost.

How to Seal Patio Slabs After Cleaning

Sealing your patio after cleaning is the step most homeowners skip, and it is why many patios need deep cleaning again within a year. A quality surface sealant penetrates the pores and creates a barrier that resists moisture, oil, biological growth, and staining.

The surface must be completely dry before applying sealant. Even slight residual moisture will cause it to cloud or peel. Allow at least 48 hours of dry weather after pressure washing before sealing.

Sealant types vary by surface and desired finish:

• Impregnating sealants penetrate below the surface and leave no visible finish. These are the standard choice for natural stone and concrete because they do not alter appearance and allow the surface to breathe.

• Topical or film-forming sealants sit on the surface and create a visible sheen. These are popular on block paving for an enhanced wet look, but they require more maintenance and can become slippery when wet.

Apply sealant with a roller or low-pressure sprayer, working in sections and maintaining a wet edge to avoid lap marks. Two thin coats are more effective than one heavy coat. Reapplication is typically needed every two to three years depending on foot traffic and weather exposure.

Post-Cleaning Maintenance Calendar

A clean patio stays clean far longer with a simple maintenance routine. The following schedule prevents the heavy biological buildup that requires a full deep clean.

Frequency	Task	Purpose
Monthly	Clear debris, leaves, and grit with a stiff brush	Prevents moisture retention and weed establishment
Every 3 months	Apply a biological cleaner or moss inhibitor	Slows algae and mildew regrowth
Every 6 months	Check and refill jointing sand on block paving	Prevents weed growth and block movement
Annually	Light pressure wash or scrub with patio cleaner	Removes accumulated surface grime
Every 2-3 years	Reseal porous surfaces	Maintains surface integrity and stain resistance

The most important habit is clearing organic debris promptly. Leaves left over autumn and winter create the damp, shaded conditions that algae and moss need. Removing them regularly prevents months of growth.

According to guidance on hard landscaping maintenance for homeowners, patios in shaded or north-facing positions need biological treatment more frequently because they dry out more slowly after rain.

When to Call a Professional to Clean Your Patio

Some patio cleaning jobs are straightforward DIY tasks. Others are not, and misjudging which can result in surface damage that costs more to fix than a professional clean.

Consider calling a professional when:

• Black lichen has been present for several years and covers a significant area. Consumer-grade machines often lack the pressure and specialist products to shift deep-rooted lichen completely.

• Your block paving has already lost jointing sand from previous DIY pressure washing. A professional service will clean, re-sand, and compact the joints correctly.

• You have natural stone that is etched, stained, or discoloured from previous incorrect cleaning. Professional soft washing uses lower pressure with specialist detergents.

• You are preparing a property for sale and need a result that genuinely improves kerb appeal. A professional clean produces a more consistent, thorough result.

Drive Revive Haddington specialises in these situations: deep cleaning driveways, patios, and block paving where consumer-grade equipment has not delivered results. The service includes re-sanding for block paving after cleaning and soft washing for surfaces where high-pressure cleaning would cause damage.

For persistent stains, slippery algae-covered surfaces, or any patio where you are not confident about the right approach, professional advice costs nothing. Request a Free Estimate and get a clear picture of what the job involves before committing to any approach.

Frequently Asked Questions

What is the best way to clean a patio without a pressure washer?

Apply a patio cleaner formulated for algae and mildew, such as a concentrate diluted with water, then scrub with a stiff bristle brush. For biological growth like moss and algae, products that require no rinsing can be applied and left to work over several days. A long-handled deck brush reduces effort on larger areas. This approach suits delicate natural stone surfaces where high-pressure nozzles risk damaging the finish or dislodging jointing sand.

How do I remove stubborn black spots from my patio slabs?

Black spots on patio slabs are almost always black lichen, not ordinary dirt. Standard patio cleaners rarely shift them. You need an alkaline cleaner specifically formulated for black spot removal on porous surfaces. Apply it, work it in with a stiff brush, leave it for the time stated on the label, then rinse thoroughly. For deeply ingrained lichen that has been present for years, professional pressure washing combined with a specialist degreaser gives the most reliable result.

Is it safe to use a pressure washer on all types of patio paving?

No. High-pressure washing suits concrete paving slabs and most block paving well, but natural stone requires care. Soft or porous stone such as sandstone can be damaged by excessive pressure, and the high-pressure nozzle can blast jointing sand out of block paving gaps. Use a fan nozzle rather than a pencil jet, keep the lance moving, and reduce pressure for delicate surfaces. After cleaning block paving, re-sanding the joints prevents weed growth and maintains surface integrity.

How often should you clean your patio to prevent algae growth?

A thorough deep clean once a year, ideally in spring, keeps most patios free of significant algae and moss. Applying a surface sealant after cleaning slows algae growth considerably by reducing porosity. A light scrub and debris removal every two to three months prevents organic matter from building up and creating the damp conditions algae need. Shaded patios that stay moist will need attention more frequently than those in full sun.

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Dirty, slippery, or discoloured patio surfaces are one of those problems that only get harder to fix the longer they are left. Drive Revive Haddington provides professional pressure washing designed to restore block paving, concrete, and natural stone to a clean, safe condition, including re-sanding block paving joints and soft washing for delicate surfaces. Request a free estimate from Drive Revive Haddington and find out exactly what a professional clean can do for your outdoor space.

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