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