Moss, algae and lichen are living organisms with root structures that sit inside the pores and joints of a surface. Pressure shears the visible top layer off. It doesn't kill what's below it.
That's the difference between a drive that looks clean for a season and one that still looks clean the following spring.
How it works in practice
- The surface is pre-wetted or cleaned depending on how thick the growth is.
- A biocide is applied evenly and left to dwell — this takes time, not force.
- The organism dies back over the following days and weathers off, or is rinsed as part of the clean.
- On heavy lichen, a second application is sometimes needed rather than a heavier wash.
Where it makes the biggest difference
- North-facing patios and shaded side returns that never fully dry out.
- Under trees and hedges, where leaf litter feeds growth every autumn.
- Porous stone such as Indian sandstone, where black spot roots deeply.
- Anywhere water sits because of poor falls or a blocked gully.
How long it holds
Realistically, a treated and re-sanded drive holds its appearance for a couple of years before the next treatment, and a shaded patio somewhat less. Sun, drainage, overhanging planting and how often the surface is swept all move that.
We'd rather give you that range than promise a number we can't stand behind.
Our promise
100% satisfaction — or we re-clean free.