This product cleans and brightens tile and grout that has become discolored over time. A low pH, low odor, and low foaming cleaner, Concrete, Tile and Grout Brightener effectively removes hard water scale and rust stains from hard surfaces and brightens them for a like-new look. Great for use on pools tub and shower enclosures – anywhere hard surfaces need thorough cleaning and brightening. Low pH product is excellent for hard water scale and rust removal. Formulated with Sapphires Signature Fresh fragrance.