Render Cleaner | UK's Best Render Cleaner

Professional Render Cleaner for Algae, Mould & Staining

GK's render cleaner range is designed to safely remove algae, mould, lichen and biological staining from rendered surfaces. Whether you have traditional render, K-render, silicone render or painted exterior walls, our products restore your render to its original appearance without damaging the underlying surface.

Over time, render attracts unsightly green and black algae, mould, oil marks and other contaminants — robbing your home of its kerb appeal. Our specialised render cleaning products combat these issues with simple, predictable results.

Why Choose GK Render Cleaner?

Effective against algae & mould — kills biological growth on contact
Safe on render — non-corrosive, non-oxidising formulas that won't damage the substrate
Long-lasting results — helps prevent regrowth, not just surface cleaning
Suitable for all render types — K-render, silicone, monocouche and painted render
HSE-approved — GK Pro is licensed under HSE no. 10766

How to Clean Render

For best results, apply on a dry day with no rain forecast for at least 4 hours and temperatures above 5°C. Our render cleaners work alongside natural weather cycles — UV light desiccates the dead biological matter while rain rinses away the residue, leaving your render looking fresh.

For heavily stained render, a second application may be needed. Lighter staining typically shows results within days, while heavier biological loads may take 2–3 months to fully clear as the weather does the work for you.

Browse our full render cleaner range below, or get in touch if you'd like advice on the right product for your project.