How to clean a patio without damaging the paving

A practical starting point

Identify the paving, remove loose debris, test a suitable gentle cleaner in a small area, clean in manageable sections and rinse as the product instructions direct. Check the joints afterwards. Stop if the surface sheds material, the joints break up or the runoff cannot be managed safely.

This is a guide to routine maintenance on sound domestic paving. It is not a treatment recipe for unknown stains, specialist stone, new jointing, oil contamination or damaged installations. Keep children and pets away while the area is wet or being treated.

1. Work out what your patio is made from

Check the installation paperwork or ask the supplier whether the surface is concrete, natural stone, porcelain or another product. Also identify the joints: loose sand, mortar and specialist compounds cannot always be treated alike. A coating or sealant can change the care instructions.

Take a close photograph of a slab and joint if you need help identifying it. Do not assume that a method used successfully on a neighbour’s patio is appropriate for yours. Loose or rocking slabs, crumbling pointing and damaged edges should be assessed before washing.

2. Start with loose dirt and leaves

Move furniture and pots only if you can do so safely. Sweep up grit, leaves and loose moss rather than washing them into drains. Notice whether shaded corners or areas under planters stay wet; those are useful places to watch during ongoing maintenance.

Keep a safe route through the garden and move trailing hoses away from steps. Wear footwear with grip. Avoid working in frost or conditions that make the surface unsafe.

3. Test a gentle wash before treating the whole area

Follow the paving supplier’s maintenance instructions. For compatible paving with ordinary dirt, a suitable mild soap-and-water wash and a non-metal brush may be sufficient. Try an inconspicuous patch first, rinse it and let it dry before deciding whether to continue. Check the finish as well as how clean it looks.

Work in small sections and follow the cleaner’s instructions for dilution, contact time, rinsing and protective equipment. Never mix cleaning products. Do not use a household bleach or acid recipe simply because it is described online as a quick patio cleaner.

Plan where the wash water will go before starting. Keep detergents, dirt and contaminated runoff out of surface-water drains, ponds and watercourses. If you cannot establish a safe disposal route, stop and obtain appropriate advice.

4. Decide whether pressure washing is suitable

Pressure washing is an option for some installations, not a compulsory step. The paving, joints, coating and equipment guidance all matter. A pressure figure copied from a general guide cannot establish a safe setting for an unknown patio.

If the manufacturer permits pressure washing, follow its instructions and the equipment manual, beginning with a small test. Avoid directing a concentrated jet into joints or at fragile edges. Stop if you see surface damage or joint material being removed. A professional assessment is sensible where condition or compatibility is uncertain.

5. Check the dry finish and joints

Wet paving can look very different from dry paving. Allow it to dry before judging the result or deciding that a remaining mark needs further treatment. Black spots, rust-coloured marks, oil staining and pale deposits may need different diagnoses; repeated aggressive washing is not a reliable answer.

If jointing has been lost, obtain advice on the correct replacement for the installation. Do not automatically sweep kiln-dried sand into every patio. Leave sealing and repairs out of a routine cleaning plan unless they are appropriate and specifically agreed.

When does professional patio cleaning make sense?

You might choose help for a large area, heavy build-up, awkward steps, uncertain materials or simply to save time. Send a wide view, a close-up of the joints and the marks you want addressed. Add the postcode, approximate area and information about access and an outside tap.

Our Cornwall patio and driveway cleaning service covers suitable paving with the method and scope agreed for the property. A cleaning quotation should make clear whether stain treatment, joint replenishment or other work is included.

More advice and source guidance

For roofline plastics, see our uPVC, fascia and soffit cleaning guide. Timber or composite boards need decking-specific care, not the paving instructions above.

• Marshalls: paving cleaning, pressure washing and joint precautions
• Environment Agency: pollution prevention and correct use of drains (business guidance)

Manufacturer instructions for the actual installation take priority. Linked guidance does not imply manufacturer endorsement of Kernow Clean.