With the power of OxiClean Stain Fighters. Changes color when clean. Sprays in blue. Turns white when clean (when the foam turns white, just brush and flush to reveal a brilliant shine). Sprays upside down. Easy application, even under the rim! Kaboom Foam-Tastic eliminates the guesswork from cleaning your toilet! Spray on the super-clinging blue foam and OxiClean Stain Fighters go to work on contact, loosening soil and stains. Cleans with a fresh scent and no obvious fumes! Removes: Hard water stains, calcium, lime and dirt. Use on: toilet bowl, outside toilet, glazed ceramic tile, fiberglass, tubs, shower doors and vinyl curtains, sinks, counter tops and chrome fixtures. Contains no CFCs which deplete the ozone layer. Federal regulations prohibit CFC propellants in aerosols.