Rejuvenate, 32 OZ, Grout Deep Cleaner, Cleans Grout & Instantly Remove Grout Stains & Restore Your Grout Back To Its Original Color, Revolutionary, Biofriendly, Non-Toxic, Acid Free Greenguard Certified Formula Is The Best Way To Clean Tile Grout, Use On Any Tile Surface Including Ceramic Tile, Porcelain Tile Or Marble, Easiest Way To Clean Grout Without Scrubbing For Hours, Strong Enough For Commercial Use But Gentle Enough To Use At Home.