Render cleaning with a soft wash, never a pressure lance.
Green and black staining on render is biological growth, not dirt. We treat it at low pressure with a solution that kills it at the root, so the finish comes back without the surface being thinned or opened up.
Why homeowners choose this service
- Low-pressure soft wash, applied at roughly garden-hose pressure
- Treatment matched to your render system
- Suits modern thin-coat, silicone and through-coloured render
- Planting and glazing protected throughout the job
- Family-run, fully insured team based in Ampthill
Why we do not pressure wash render
A pressure lance makes render look clean quickly, but it can thin or open the surface. That leads to a patchy appearance and faster regrowth, and on through-coloured render it is the usual cause of colour loss.
A soft wash works the other way round: the solution does the work, not the force. It breaks down the biological film that gives render its dull green-black cast. If you want the detail first, read our render cleaning guide or the render cleaning cost guide.
How a render clean works
A careful, methodical approach designed to protect your roof and your property.
Check the render
We look at the render system and the staining so the treatment suits the surface.
Protect and apply
Planting and glazing are protected, then the soft wash is applied evenly at low pressure.
Rinse and clear down
The surface is rinsed where needed and the area is left tidy.
Algae on render: green and black staining
Green algae on render usually appears first on shaded and north-facing walls, under window sills and wherever water runs down the face of the house. Black algae on render tends to be more stubborn and sits deeper in textured finishes. Both respond to a soft wash and biocide, which kills the growth rather than just moving it around.
Cleaning rendered walls with a pressure lance can thin through-coloured render and leave a patchy finish, so our render softwash is always low pressure.
Can you clean render, and what is the best render cleaner?
Yes, most render can be cleaned. People often look for the best render cleaner product in the UK, but the result depends as much on the method as the product: the right biocide, applied at low pressure and given time to work, outperforms anything scrubbed or blasted on.
As a render cleaning company based in Ampthill, we cover Bedfordshire and the surrounding counties, and we can quote the roof and gutters at the same visit.
Cleaning K Rend and monocouche render
Through-coloured renders such as K Rend and monocouche need the gentlest approach of all, because the colour runs through the material and a thinned surface shows. Our K Rend cleaning page explains how the soft wash is applied and what to expect afterwards.
If the roof, gutters and fascias need attention too, an exterior house clean covers them in one visit, working from the roof down.
Frequently asked
Will cleaning remove the colour from my monocouche render?
Not with low-pressure chemical cleaning. Colour loss on through-coloured render is almost always caused by a pressure lance thinning the surface.
Is a soft wash safe on silicone and thin-coat render?
Correctly applied, yes. Soft washing is the recommended approach for modern thin-coat and silicone render precisely because pressure washing damages them.
Why is a pressure-wash quote cheaper?
The method is faster. It looks clean sooner but risks thinning or opening the render, which leads to a patchy finish and faster regrowth. We do not use pressure on render.
Can you clean the roof at the same visit?
Yes. We also clean roofs by hand and apply biocide treatments, so render and roof can be quoted together.
How do I get a price?
Call 01525 600162 or send a few photos through the quote form for a free, no-obligation quote.
What is render cleaning?
It is removing algae, lichen and dirt from rendered walls. We do it with a low-pressure soft wash and biocide rather than a pressure washer.
What is the best way to clean render?
A low-pressure soft wash with a biocide that kills the growth, given time to work. High pressure risks thinning or marking the render.
How long does render cleaning last?
It varies with shade, tree cover and exposure. Because the biocide kills the growth at the root, results last much longer than a surface wash.
Related pages
More detail on where we work, what we find on roofs, and how the job is priced.