Rolling Stone Moss Control is a new product. It can be used to kill mould, algae, lichen, and moss. It will keep it, at bay for up to 12 months and can be used on concrete, brickwork, timber, painted surfaces, Indoor and outdoors. This product when used correctly will penetrate right through to the spores of the fungi will weather away by itself over a period of a month. It can be jet washed after a week.