What is soft washing and why is it used for render?

Soft washing combines low-pressure application with an appropriate treatment for surface growth. It avoids treating render like paving, but suitability still depends on the finish, condition and manufacturer guidance. Existing cracks or loose areas may need attention before cleaning.

Can you clean K-Rend and monocouche render?

We assess these finishes before selecting a treatment. Let us know about the product used, previous coatings and any damage. A suitable method and realistic expectations must be agreed for the individual property rather than assuming every rendered surface can be cleaned in the same way.

How long do render cleaning results last?

There is no fixed period for every property. Shading, nearby vegetation, moisture and the original condition affect how quickly staining returns. We can discuss maintenance after assessing your walls, but cannot guarantee a set number of years without regrowth.

My render is painted — can you still clean it?

Yes, though painted render requires a gentler approach to avoid lifting the paint. We'll assess the condition of the paint first and advise whether cleaning or repainting would be the better option.

Render & Exterior Wall Cleaning

Render Cleaning

Q: Where is render cleaning available?

We provide render cleaning across every location in the Top Glass service area, including Weston-super-Mare, North Somerset, the Chew Valley and Bath and North East Somerset. Check our areas page for the complete list of locations.

Low-pressure render cleaning across our existing service areas. We assess the finish and condition before treating algae, dark staining and lichen, rather than using the same pressure-washing approach as a paved surface.

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Professional Render Cleaning across North Somerset and Bath and North East Somerset

About this service

Professional Render Cleaning Across North Somerset & North East Somerset

Render cleaning is available across all locations covered by Top Glass, including Weston-super-Mare, North Somerset, the Chew Valley and Bath and North East Somerset. K-Rend, monocouche, pebbledash and painted render can develop algae, lichen and other surface staining. The appropriate treatment depends on the finish and its condition: excessive pressure can damage a vulnerable surface or force water into existing defects. Our low-pressure soft-wash approach is assessed for the property, with realistic advice about staining, existing damage and ongoing maintenance.

What's included

K-Rend, monocouche and painted render all covered
Low-pressure method selected for the render finish
Treatment for suitable areas of biological growth
Green algae, dark staining and lichen assessed
Dramatically improved kerb appeal
Maintenance advice based on exposure and condition
Suitability assessed before work on each property
Free site inspection and honest advice

Green algae, dark marks or a defective finish?

Green growth and some dark staining can be associated with biological growth, but colour alone does not diagnose the cause. Tell us the render type if known, its age and whether there are cracks, loose areas or flaking paint. A cleaning assessment should distinguish surface soiling from defects that need a render or painting specialist.

Arrange an assessment of stained exterior render

Why the cleaning method differs from jet washing

Render is not treated as a paved driveway. The finish, condition and any manufacturer guidance influence the choice of treatment and low-pressure application. We assess suitability before agreeing the work. Ask about the expected result and any limitations: cleaning does not repair cracks or guarantee that every discoloured area will return to its original shade.

See where hard-surface pressure washing is appropriate instead

Plan maintenance around your property

Shade, persistent damp conditions and nearby vegetation can influence how quickly surface growth returns. An exposed coastal elevation in Clevedon and a sheltered wall elsewhere may need different maintenance, but location alone does not determine a fixed interval. Keep gutters flowing and discuss persistent wet patches separately rather than assuming cleaning will resolve a building defect.

Read about clearing gutters and reporting visible defects

How it works

Your Render Cleaning in 4 simple steps

Render type assessment

We identify your render type (K-Rend, monocouche, painted, pebbledash) and the extent of staining before selecting the correct biocide and dilution.

Biocide application

Professional biocide is applied to all affected areas and left to dwell, killing algae, lichen and bacteria at the root level.

Soft wash and rinse

We use low-pressure water to carefully remove the dead growth and biocide residue without damaging the render surface.

Final inspection

We walk the property with you and advise on any areas of render damage or repainting that may benefit from attention.

Transparent pricing

What Affects the Price?

Every property is different. These are the main factors we consider when putting together your quote.

Total surface area

Render cleaning is priced by square metres of wall to be treated. A small semi-detached costs considerably less than a large detached property on all four elevations.

Render type

K-Rend, monocouche, pebbledash and painted render each require specific biocide dilutions and application methods, which can affect the overall price.

Staining severity

Light surface algae responds quickly to treatment. Heavy lichen, deeply embedded black staining or years of biological growth requires longer dwell times and extra product.

Access requirements

Most properties can be treated from the ground or using standard equipment. Properties requiring scaffolding or specialist access are quoted separately after a site survey.

Use our online quote form, or call us to discuss your specific property.

Results