Comparisons
Jet Washing vs Soft Washing: What's the Difference?
7 min read · Updated August 2026
Jet washing and soft washing are often talked about as if they're interchangeable, but they work in quite different ways and suit different surfaces. Using the wrong method can strip mortar joints, etch stone, or simply fail to shift the algae and grime you're trying to remove.
This guide explains how each method works, where each one shines, and what it costs in 2026 for typical UK jobs. We carry out both jet washing and soft washing on driveways, patios and other exterior surfaces across Wokingham, Earley, Arborfield, Spencers Wood, Sindlesham, Farley Hill, Bracknell and Winnersh.
If you're unsure which approach suits your surface, it's worth asking before booking — call 07769315849 and we can advise based on the material and condition.
How jet washing works
Jet washing (often called pressure washing) uses a concentrated, high-pressure stream of water — typically 1500 to 3000 PSI depending on the machine and nozzle — to physically blast dirt, moss, algae and old sealant off a surface. It's fast and highly effective on hard, durable materials like concrete, block paving and natural stone that can withstand the force.
The downside is that high pressure can be too aggressive for softer or more delicate surfaces. Used carelessly, it can strip pointing from between paving blocks, etch soft sandstone or render, damage wood fibres, or force water behind rendering and into brickwork where it can cause damp problems later.
How soft washing works
Soft washing uses low pressure combined with a specialist cleaning solution — usually a diluted biocide that kills algae, moss and lichen at the root rather than just blasting off the visible growth. The solution is left to dwell on the surface for a period before being rinsed off, sometimes at low pressure.
Because it doesn't rely on force, soft washing is much gentler on delicate surfaces like render, roof tiles, cladding and painted or soft masonry. It also tends to keep growth at bay for longer than jet washing alone, since the biocide treats the algae and spores rather than just removing what's visible on the surface.
Cost comparison for 2026
| Surface | Jet washing | Soft washing | Recommended method |
|---|---|---|---|
| Concrete driveway | £150 - £350 | £180 - £380 | Jet washing |
| Block paving driveway | £180 - £400 | £220 - £450 | Jet washing (careful, low pressure on joints) |
| Natural stone patio | £150 - £320 | £180 - £360 | Either, depending on stone type |
| Render / cladding | Not recommended | £250 - £600 | Soft washing |
| Roof (moss/algae) | Not recommended | £300 - £700 | Soft washing |
| Timber decking | £120 - £250 (low pressure only) | £150 - £300 | Soft washing or careful low-pressure jet wash |
Which surfaces suit which method
Hard, durable surfaces designed to withstand weather and wear — concrete, engineered block paving, granite setts and sound natural stone — generally handle jet washing well, provided the operator uses appropriate pressure and a rotary surface cleaner rather than a narrow jet held too close. This is usually the quickest and most cost-effective way to bring a dirty driveway or patio back to looking new.
Softer or more porous surfaces — render, pebbledash, roof tiles, natural slate, painted brick and timber cladding — are better suited to soft washing, since high pressure risks driving water into the material, dislodging tiles, or stripping paint and pointing. If you're not sure which category your surface falls into, it's worth asking a professional to assess it before committing to a method.
Results and how long they last
Jet washing gives an immediate, visible transformation — dirt and growth are physically removed there and then. However, because it doesn't treat the biological growth at a cellular level, algae and moss can return within months, particularly on shaded or damp surfaces.
Soft washing often looks less dramatic on the day, since some dead algae and lichen may take a few days to fully wash away or weather off, but the biocide treatment typically keeps surfaces cleaner for longer — often 12 months or more compared with jet washing alone, which is why many roof and render cleaning services use soft washing as standard.
Environmental and safety considerations
Soft washing chemicals are generally biodegradable and used in controlled, diluted concentrations, but they still need care around plants, ponds and permeable drainage, and should be applied by someone experienced in dosing and application to avoid harming nearby vegetation.
Jet washing doesn't involve chemicals but does use significant volumes of water and can generate a lot of dirty run-off, which should be managed properly, particularly near drains, to avoid sending sediment, oil residue or old sealant into the water system.
Making the right choice for your job
In practice, many exterior cleaning jobs use a combination of both — jet washing hard paving and driveways, and soft washing render, roofs or delicate stonework on the same property. A competent contractor should assess each surface individually rather than applying one method across the board.
If you're planning a full exterior refresh — driveway, patio and walls — it's worth getting a single quote that specifies which method will be used where, so you know the right approach is being taken for each surface. Call 07769315849 for an assessment.
Frequently asked questions
- Can jet washing damage my driveway?
- Yes, if pressure is too high or the nozzle held too close, jet washing can erode soft stone, strip sand from block paving joints, or damage sealant. A rotary surface cleaner and correct pressure setting reduce this risk considerably.
- Is soft washing safe for plants nearby?
- Soft washing solutions can harm plants if not diluted and applied carefully, so a competent operator will cover or wet down nearby vegetation and rinse thoroughly after treatment.
- Which method lasts longer, jet washing or soft washing?
- Soft washing generally keeps surfaces cleaner for longer because it treats algae, moss and lichen at the root, whereas jet washing only removes visible growth, which can return within months.
- Can I jet wash render or pebbledash?
- It's not generally recommended, as high pressure can force water behind the render and damage the substrate. Soft washing is the safer choice for these surfaces.
- How often should a driveway be jet washed?
- Most driveways benefit from a jet wash every 12-24 months depending on exposure, tree cover and traffic, though light annual cleaning can extend the interval needed for a deep clean.