JCB Heavy Duty Path & Patio Cleaner Removes mould, algae & kills moss. This product is designed to clean moss, algae, & everyday dirt away from the affected areas & to destroy the spores which are produced by the moss & algae. This will help lengthen the time in which moss & algae reforms. Contents 2 x JCB Heavy Duty Path, Patio & Deck Cleaner 5L