X-14 Professional Mildew Stain Remover instantly cleans and removes the toughest stains. This slightly stronger, bleach-based formula penetrates deep and works without scrubbing. It is perfect for removing mildew stains from boat and RV hard surfaces. It is also safe for sealed grout, tile, vinyl, and plastic surfaces. Available in 1-gallon sizes for the professional boat and RV detailer.