Mosgo Green Remover by Hygeia is the fast and easy way to a clean, moss free driveway, killing moss on virtually any surface, from tarmac and slates to driveways, pathways and patios. No power washing needed helping to keep water usage down. No scrubbing needed, just apply and walk away. I ideal conditions treatment should be effective after 3-4 days if applied correctly. If required, dead moss can then be brushed from the surface.