Hard, nonporous surfaces including glazed ceramic tile, porcelain, glass, stainless steel, plastic laminate, sealed granite, vinyl and silicone are all surfaces you can use a bleach and water solution to treat mold and mildew when used as directed. Do not use on marble, non-stainless steel, aluminum, chipped porcelain and porous tile. If unsure, test an inconspicuous area first for surface compatibility.