Krud Kutter Multi-Purpose House Wash contains Sporex to provide the ultimate clean with special surfactants on nearly any surface. Safe cleaner can be used to remove stains from mildew, mold, algae, fungus and moss to messes from dirt, oil, grease, bird droppings, tree sap, acid rain and more. Apply on exterior siding (wood, vinyl, aluminum), all types of roofing (asphalt shingles, fiberglass shingles, cedar, tile), gutters, stucco, brick and cement block, masonry, walkways and walls. Product is able to remove gray weathering on wood, chalking and oxidation.