Is soft washing safe on slate?

Yes — it's the only method we recommend on slate. No pressure, no scrubbing, no foot traffic on the tiles.

How is this different from biocide treatment?

Soft wash is a stronger, broader-spectrum chemical mix designed to clean as well as prevent. Biocide treatment is preventive only — for roofs that are already clean.

Will it kill my plants?

We mask plants beneath the work area and rinse paths/decking after. Modern soft-wash chemistry is selective and breaks down on contact with soil.

How long until I see results?

First visible change in about a week. Full result in 4–8 weeks as dead growth weathers off.

3–5 years typically. We can add a top-up biocide treatment every 2 years to extend that to 8+.

HomeSoft Washing

Soft Washing

Gentle method. Long-lasting result.

Low-pressure chemical roof cleaning across South Wales. The right method for slate, painted render and fragile tile — safe on the surface, effective against algae and lichen.

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Soft Washing

How soft washing works

A biocide-rich solution is applied at low pressure and left to dwell on the surface. The chemistry breaks down algae, lichen and organic growth at the root, then a gentle rinse takes everything away. It’s the right method for Welsh slate — it kills the growth without the disturbance of high pressure.

Safe on slate, render & painted surfaces
Treats algae, lichen and black streaks
Kills the growth at the root — long-lasting
Gentle on the tile and the bedding
Plant-safe rinsing

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