X-14 removes mildew stains faster and more completely than leading competitors. Not only does X-14 mildew stain remover work without scrubbing, it"s been proven to remove mildew stains faster and more completely than competitors. Use it on sealed grout, tile, vinyl and plastic surfaces. X-14 is also great for use on any hard surface where mildew stains might form -- in the bathroom, kitchen, on campers, boats and more!