Homax Tile Guard Extra Strength Tile & Grout Cleaner is the product to use when you have really soiled ceramic and porcelain tile and grout that needs cleaning. This industrial strength cleaner is a non-acidic formula is safe for your surfaces in both interior and exterior use. It digs down deep to thoroughly clean tile floors, walls, countertops and even removes mildew stains from most tile surfaces. Heavy soil build-up is most visible in entryways, showers or on neglected tile and grout. Procedures and chemicals to remove these build-ups can often be harmful to surfaces. Extra Strength Tile and Grout Cleaner is an easy-to-use restoration cleaner. It will remove soils from the surface for effortless cleaning, while remaining safe for daily use.