Wet & Forget produce an excellent garden product which removes unsightly mould, lichen & algae from concrete, patio's, garden decking, paths, pavements, fencing and garden walls. Wet & Forget can also be used on greenhouses, sheds and conservatories removing and preventing the further growth of mould etc. Wet & Forget contains no bleach, is (almost) PH Neutral and cleans any exterior surface safely with no water blasting or scrubbing required. Concrete and Patio Cleaning