Unique patented formula removes mildew stains and provides effective long-term mold and mildew stain prevention. Cleans mildew stains, soap scum, and mineral deposits (calcium and lime) and prevents mold and mildew stains from returning. Safe to use indoors and outdoors on aluminum, glass, fiberglass, stone (except natural marble), cultured marble, acrylic, PVC, vinyl, porcelain, rubber, chrome, plastic, formica, and more. This product has bleach in it as well as surfactants (detergents) for cleaning. It is not recommended for use on fabric as it will take color from fabrics.