Mold & Mildew Stain Remover is made with a bleach-free formula that quickly removes surface mold & mildew stains on a wide variety of surfaces including painted walls, ceramic tile, hardwood floors, glass, concrete & more. It should not be used on metals or finishes, especially chrome or stainless steel. Foam sprayer allows direct application, preventing splash back & spores from spreading in the air. Biodegradable stain remover is EPA Safer Choice certified by using safer ingredients.