Porcelain & Ceramic Tile Cleaner is a unique penetrating scouring compound that quickly and easily removes stubborn stains, grease, soap scum, heel and scuff marks, dirt and everyday grime, Porcelain & Ceramic Tile Cleaner can be used by hand or with a floor machine and will also clean grout very well. Porcelain & Ceramic Tile Cleaner will also remove hard water deposits and soap scum on stone showers.