When all other cleaners have failed, choose Viper Renew to remove soils and stubborn stains on stone, grout and tile! Containing special organic salts, Viper Renew is twice as effective as phosphoric acid at dissolving mineral deposits - and without the unpleasant fumes.

It removes a very thin layer of grout or stone, taking with it all the hard water deposits, soap scum, efflorescence and staining (Avoid contact with metals!)