Roof Cleaning, Moss Treatment or Soft Washing?
Written by the Swansea Conservatory Roofs team · Last reviewed 3 November 2026
The right answer depends on what's growing, what surface it's on and how delicate that surface is. Many homes need more than one method.
| Problem | Usually suits | Why |
|---|---|---|
| Thick moss on tiles | Moss removal, then treatment | Removes the bulk and slows regrowth |
| Green or black staining on tiles | Soft washing | Treats growth at low pressure |
| Dirt on strong, sound tiles | Controlled pressure cleaning | Effective, if the tile can take it |
| Green or black render | Render soft washing | Avoids damage from high pressure |
| Cracked or blown render | Cladding or specialist repair | Cleaning won't fix the wall |
A word on safety. Please check from the ground, not from a ladder.
Send us a photo, and we'll tell you which applies. See what roof cleaning costs.