X-14(TM) Mildew Stain Remover works without scrubbing, it’s also 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! 1 Gallon.