Mold and mildew stains are unsightly. They require a powerful, specialized cleaner. Commercial Mold Stain and Mildew Stain Remover is formulated to put the power of bleach to work cleaning toilet bowls, sinks, ceramic tile, grout and many other unpainted surfaces. It Whitens fiberglass, tile and grout. Use industrial-strength formula indoors and out. Simply spray, wipe and rinse clean.