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

Soft washing uses low water pressure combined with specialist cleaning agents to kill and remove biological growth. High-pressure washing can damage render, crack K-Rend and force water behind the surface. Soft washing achieves better results with no risk of damage.

Will render cleaning damage K-Rend?

Soft washing at correct pressures is completely safe for K-Rend and monocouche render. We never use the high pressures that cause cracking and surface texture damage.

How long do render cleaning results last?

Most properties see clean results lasting 2–5 years depending on location and aspect. North-facing walls and those in sheltered, damp spots may need retreating sooner.

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

Render staining makes even beautiful homes look neglected. Our specialist soft-wash render cleaning removes green algae, black streaks and lichen from all render types — safely, without high pressure that causes damage.

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About this service

Professional Render Cleaning in North Somerset

Modern and traditional render finishes — including K-Rend, monocouche, pebbledash and painted render — are highly prone to biological staining from algae, lichen and green moss. High-pressure washing damages render surfaces and often makes the problem worse by spreading growth spores. Top Glass uses a specialist low-pressure soft-wash approach combined with professional biocide treatments to safely and effectively clean exterior render, achieving results that typically last for years.

What's included

K-Rend, monocouche and painted render all covered
Soft-wash method — no high-pressure damage
Biocide treatment kills growth at the root
Green algae, black staining and lichen removed
Dramatically improved kerb appeal
Results typically last 2–5 years
Safe for all property ages and render types
Free site inspection and honest advice

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 instant quote calculator for an immediate estimate, or call us to discuss your specific property.

Results