How to Pressure Wash Your Patio and Driveway - Complete UK Guide

Your patio and driveway take a beating from the UK weather. Rain, mud, algae, moss and general grime build up over winter until your slabs look more grey-green than their original colour. A pressure wash brings them back, and its one of the most satisfying DIY jobs you can do in a weekend.

But pressure washing is not as simple as pulling the trigger and hoping for the best. Get it wrong and you can etch concrete, blow out mortar joints, or gouge soft stone. Get it right and you'll have the smartest driveway on the street.

This guide covers everything you need to know for the job: what pressure washer to buy, which attachments help, which detergent to use, and the technique that gets results without damaging your paving. We've compared this on block paving, concrete slabs, sandstone and limestone so you don't have to learn the hard way.

What Pressure Washer Do You Need?

The first question is simple: will your current pressure washer do the job, or do you need something with more grunt? For patios and driveways, you want an electric pressure washer rated at 130 bar or above. Budget machines around 100 bar will clean a car or garden furniture but struggle with ground-in algae on block paving.

The three brands we recommend for patio work are Karcher, Bosch and Nilfisk. All three have models in the 130-150 bar range that balance cleaning power with a price that makes sense for home use.

Why You Need a Patio Cleaner Attachment

If you only buy one accessory for pressure washing, make it a patio cleaner attachment. Also called a surface cleaner or rotary washer, this gadget replaces the standard lance with a wide circular head that spins two high-pressure jets inside a shroud. You glide it over the slabs and the rotating jets strip off the grime while the shroud stops everything from splashing back at you.

Without one, you'll be bent over for hours with the standard lance, leaving tiger-stripe marks where your inconsistent hand speed overlaps. A patio cleaner cuts the time by half and gives you an even finish every time.

Step-by-Step: How to Pressure Wash Your Patio & Driveway

Step 1: Clear and sweep

Move everything off the patio - plant pots, furniture, BBQ, bins. Give the whole area a good sweep with a stiff brush to remove loose debris, leaves and surface dirt. This stops the debris from blasting around when you start pressure washing and scratching the stone. If your paving has weeds poking through, pull them out now rather than trying to blast them out later (that just widens the joints).

Step 2: Protect nearby plants and walls

Pressure washer detergent can damage plants and strip paint off walls. Cover nearby flower beds with a dust sheet or plastic sheeting. Wet the plants before you start to help dilute any overspray. If you're using a patio cleaner attachment (which contains the spray), overspray is minimal, but it pays to be careful.

Step 3: Apply detergent

For patios with visible algae or moss, applying a dedicated patio cleaner before pressure washing makes a big difference. Jeyes 4 In 1 Patio & Decking Cleaner is the go-to product for UK paving. Spray or brush it on, leave it for 15 to 30 minutes, and it breaks down the organic growth so the pressure washer has less work to do.

If your patio just has regular dirt and grime with no significant growth, you can skip the detergent and go straight to pressure washing.

Step 4: Fit the patio cleaner attachment

Attach the surface cleaner to your lance according to the instructions. Fill the detergent tank if your model has one. Set the pressure to medium-high on your machine's adjuster. If you're using the standard lance instead of a surface cleaner, fit a fan nozzle (40 degree is best) and keep the tip at least 20cm from the surface. Never use a turbo nozzle on paving - it's too aggressive and will leave marks.

Step 5: Wash in overlapping passes

Start at one end of the patio and work across in straight lines, overlapping each pass by about a third. Move the surface cleaner at a steady pace - too fast and you'll leave stripes, too slow and you could mark the stone. For block paving, work at a slight angle to follow the pattern.

For concrete slabs, straight lines are fine. If you're using the standard lance, hold it at a 45-degree angle and use a wide sweeping motion. Never hold it perpendicular to the surface or you risk forcing water into the joints.

Step 6: Rinse from a distance

Once the whole area is washed, switch to the standard lance with a wide spray setting or rinse attachment. Rinse from about 60cm away to wash off any remaining detergent and loosened debris. Work from high to low so the dirty water runs off the clean areas.

Step 7: Brush and re-sand block paving

If you have block paving, pressure washing will wash out the kiln-dried sand from the joints. Once the surface is bone dry (leave it at least 24 hours), brush new kiln-dried sand into the joints using a stiff broom. This stops the blocks from shifting and prevents weed growth. For patios on mortar, check the joints and re-point any that have been washed out.

Choosing the Right Detergent

Not all pressure washer detergents are the same, and the right one depends on what you're cleaning. Jeyes 4 In 1 Patio & Decking Cleaner (4 Litre) is our top pick for UK block paving and stone patios. It kills algae and moss on contact, lifts ingrained dirt, and can be applied with a watering can or pressure washer detergent tank. For concrete driveways, a general-purpose pressure washer detergent works fine. Avoid bleach-based cleaners on natural stone - they can discolour it permanently.

If you have a large driveway and want to buy in bulk, the Jeyes 4 In 1 (newer formula, 4 Litre) is the same active ingredients in a revised bottle. Both work identically. The 4 litre bottle covers around 40 square metres of patio.

Surface-Specific Tips

Block paving: Use a fan spray at 45 degrees and keep moving. Block paving joints are the weakest point - too much pressure in one spot blows the sand out. After washing, always re-sand. Use a patio cleaner attachment set to moderate pressure for best results.

Concrete slabs: Concrete can take more pressure than any other paving material. You can use a turbo nozzle if you keep it moving, but a surface cleaner gives a more consistent finish. Watch out for efflorescence (white chalky deposits) - pressure washing removes it temporarily but it returns when the slab dries. Sealing the concrete after washing prevents it.

Sandstone and limestone: These are the riskiest surfaces to pressure wash. Soft stone can erode under high pressure, leaving a rough texture that holds dirt faster than before. Use the lowest pressure setting and stand further back (30-40cm). Never use a turbo nozzle or a surface cleaner on natural stone. A soft brush attachment is a safer option.

Decking: Pressure washing wood decking is a different job to paving. Use a dedicated decking cleaner nozzle or a soft brush attachment at low pressure (under 100 bar). Keep the lance at 45 degrees and follow the grain. Never use a turbo nozzle on timber - it will shred the surface fibres instantly.

Aftercare: Sealing Your Patio

Once the patio is clean and dry (give it at least 48 hours in summer weather), applying a patio sealer locks in the results and stops algae coming back quickly. Sealer fills the microscopic pores in stone and concrete that hold moisture, which is what algae and moss need to grow. A sealed patio stays clean three to four times longer than an unsealed one.

You don't need to seal every year. Once every two to three years is enough. Resealing is much quicker than cleaning because there's less dirt to shift.

Frequently Asked Questions

Products Mentioned in This Guide

For more on choosing the right pressure washer for your specific needs, read our Best Pressure Washers UK 2026 roundup. If you are just building your home tool collection, our Essential Home DIY Tools guide covers everything you need for basic maintenance and repairs.

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Last reviewed: July 26, 2026 · Evidence-based content · Contains affiliate links