This episode explains why blasting Indian sandstone with high pressure often leaves lichen roots behind, causing rapid regrowth and unnecessary surface damage. It also breaks down the professional softwash approach: pre-wetting, surfactants for better dwell time, and residual biocides for longer-lasting protection.

Show Notes

• Patio Black Spots: Why They Return & How to Stop Them – SoftWash UK Ltd: https://www.softwashing.uk/blogs/news/patio-black-spots-why-they-return-how-to-stop-them