Resin-bound driveways are popular across the North East for their smooth, weed-resistant finish, but that finish is more delicate than it looks. Pressure washing a resin driveway is possible in a limited, controlled way, but do it wrong and you can loosen the stone aggregate from the resin binder permanently.
This guide covers the safe pressure range, why moss and UV fading need different treatment to dirt, and when it's worth calling in a professional rather than reaching for the jet washer in the shed.
The short answer: low pressure only, and carefully
Resin-bound surfacing is stone aggregate held together with a UV-stable resin binder, laid as a permeable layer that lets water drain through. High pressure directed too close, or held in one spot too long, can strip resin from individual stones, creating rough patches, colour variation, and loose grit that then washes into drains.
If you do pressure wash, keep the machine below around 100-130 bar (roughly 1,500-1,900 psi), use a wide fan jet rather than a turbo nozzle, and keep the lance moving at least 30cm from the surface at all times. Never use a rotary surface cleaner head on resin, since the spinning close-range jets are exactly the kind of concentrated force that causes damage.
UV fading and how to manage it
South-facing resin driveways fade over several years regardless of cleaning method, as UV breaks down the resin's clarity. Cleaning won't reverse fading, but a UV-stable resin topcoat reseal can restore colour depth and gloss, typically applied every 3-5 years depending on sun exposure.
Avoid strong bleach or chlorine-based cleaners on resin, since they can react with the binder over repeated use and accelerate dulling faster than sunlight alone would.
Dealing with moss and algae without harsh pressure
Because resin driveways are permeable, moss and algae can take hold in the surface texture, especially on shaded or north-facing drives. A biocide moss and algae treatment applied by sprayer, left to dwell, then gently rinsed with low pressure, clears growth without disturbing the stone.
Treating first and cleaning after gives a longer-lasting result than jet washing alone, since jet washing without treatment just knocks the visible growth off while spores remain in the resin's texture, ready to regrow within a season.
Typical costs and when to call a professional
A professional resin driveway clean, including moss treatment, typically costs around £4-£7 per square metre, a little more than standard block paving cleaning because of the careful pressure control needed. If your resin drive already shows loose or thin patches, that's a sign a previous clean was too aggressive, and it's worth getting a professional opinion before more cleaning makes it worse.
It's also worth asking any contractor quoting for the job what pressure setting and nozzle type they intend to use before they start, since a specialist familiar with resin surfacing should be able to answer confidently without hesitation. A vague answer, or one that involves a rotary surface cleaner attachment, is a reasonable prompt to look elsewhere.
Drainage and long-term surface health
Resin-bound driveways rely on their permeable structure to let rainwater soak through into the sub-base rather than pool or run off, and a driveway that's become clogged with fine grime, algae film or compacted debris over the surface can start losing that permeability over time. Regular gentle cleaning, done correctly, helps keep the surface breathing as intended, which in turn helps prevent the standing puddles that give moss and algae an easy foothold to begin with.
If your resin drive is pooling water rather than draining through after rain, that's often an early sign the surface needs attention sooner rather than later, before the clogging gets bad enough to affect the sub-base underneath.
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