Ecofective Safe to Clean Outdoor Cleaner contains no harsh chemicals or acids. It is an excellent cleaning formula for use on a wide range of outdoor surfaces, including concrete, plastic and stone. It is safe to use around children, pets and bees, and is popular with professional contract cleaners. The non-hazardous surfactants provide the initial cleaning effect whilst the friendly bacteria work by feeding off the dirt. Simply gently brush the formula on to a dirty surface, then leave, for it to begin working. 1.5 litre container.