Render can transform the look of a home—when it’s clean.
Unfortunately, in the damp UK climate, many properties in Bristol and the South West develop green, red, or black staining over time. The culprit? Algae, moss, and pollution.
But the good news is that with professional cleaning, your render can look almost brand new again. Below, we’ll share some before and after results from render cleaning projects across the Bristol area—and explain why the right cleaning method makes all the difference.
Why Render Turns Green (or Red, or Black)
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Green staining = algae and moss
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Red staining = certain species of algae common in shaded or coastal areas
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Black streaks = pollution, mould, or lichen
Moisture + shade = the perfect environment for organic growth. That’s why many north-facing walls or homes near trees and hedges suffer worst (source).
The Problem With DIY Cleaning
Some homeowners try jet washing their render—but this can cause more harm than good. High-pressure washing can crack or strip render, leaving permanent damage.
That’s why at Leeksons Render Cleaning, we use soft washing and steam cleaning:
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Low-pressure application of specialist cleaning agents
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Kills algae, mould, and spores at the root
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Leaves render looking fresh without damaging the surface
Incredible Before and After Results in Bristol
We’ve cleaned hundreds of properties in Bristol, Portishead, Yate, Chepstow, and Long Ashton. The difference is always striking:
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Before: Dull, stained walls with green or red patches
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After: Bright, clean render that looks years younger
Render cleaning not only improves kerb appeal but also protects your property by stopping algae and moss from spreading.
👉 Take a look at more of our work here: Leeksons Render Cleaning Gallery.
Benefits of Professional Render Cleaning
✔ Restores kerb appeal and adds value to your home
✔ Safe for all types of render (K-Rend, monocouche, painted render)
✔ Long-lasting results with biocide treatment
✔ Prevents algae regrowth for 12–24 months
✔ Avoids the risks of DIY pressure washing
For more on why soft washing is better than pressure washing, check out our guide: Soft Washing vs Pressure Washing: Which Is Best for Render?
Final Thoughts
The difference a professional clean makes is truly night and day. If your render is green, red, or blackened, don’t settle for living with it—or risk damage with DIY jet washing.
👉 See more examples and request a free quote here: Leeksons Render Cleaning.