303 Mold Mildew Stain Remover The 303 Mold Mildew cleaner plus blocker is designed to work on all water-safe surfaces and leaves behind a fresh scent. This biodegradable cleaner contains no bleach and is safe for vinyl and fabrics. The cleaner quickly removes old mold and mildew stains on contact while the blocker helps prevent the stains from re-occuring. Features Made in USA Biodegradable Bleach Free Removes stains on contact Safe for Vinyl, Fabrics, Plastics Available in 16oz, 32oz, and Ga