Exterior Cleaning
Exterior Cleaning That Restores, Not Damages
Render, brick, driveways and patios all build up algae, grime and moss over time. We soft-wash exteriors back to their original condition without the surface damage high-pressure jetting can cause.
- Fully insured tradespeople
- 10-year workmanship guarantee
- Rapid emergency response
- Locally based in Welwyn
Signs you need this service
- Green or black algae staining on render or brickwork
- A driveway or patio that looks consistently dirty despite sweeping
- Moss growing in the joints of block paving or between patio slabs
- Render that has visibly darkened compared to when it was first applied
- General exterior grime that makes the property look tired from the street
Our process
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1
Assess the surface
We identify the surface type (render, brick, block paving, natural stone) to choose the right cleaning method.
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2
Soft-wash treatment
We use low-pressure soft-washing with appropriate cleaning solutions rather than aggressive high-pressure jetting, which can damage render and erode pointing.
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3
Treat algae and moss
A biocide treatment is applied where needed to slow regrowth of algae and moss.
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4
Rinse and inspect
The area is rinsed and inspected to confirm an even, thorough clean.
Why choose CS Roofing
- Soft-washing approach — no aggressive high-pressure jetting that damages surfaces
- Suitable for render, brick, driveways, patios and block paving
- Treatment applied to slow algae and moss regrowth
- Can be combined with roof cleaning & moss removal in the same visit
Frequently asked questions
What's the difference between soft-washing and pressure washing?
Soft-washing uses low pressure combined with appropriate cleaning solutions to lift dirt and organic growth without damaging the surface; high-pressure jetting can erode render, strip pointing and force water into surfaces it should stay out of.
Can you clean render without damaging it?
Yes — this is exactly why we use soft-washing rather than pressure washing on render, which is a surface particularly prone to pressure-washing damage.
Do you clean driveways and patios as well as walls?
Yes, we clean driveways, patios and block paving, including treating moss growth in paving joints.
Can this be combined with roof cleaning?
Yes — many customers combine exterior cleaning with our roof cleaning & moss removal service for a complete exterior refresh in one visit.