If your butyl rubber is stained with moss, black moulds, algae, lichen or other biological growth, use SORTED Moss and Mould. This powerful targeted formulation kills damaging moss, mould, algae and lichen. It goes on to protect the surfaces all season long.
Simply click the pack onto the end of your hose, spray on the formula and leave. The foam penetrates the surface killing the damaging organisms and they will then weather off naturally over time.