Zep® Shower Tub and Tile Cleaner, Pleasant Scent, 1 gal, 4/Carton (ZPEZUSTT128A) Case of 4Cleaner dissolves soap scum, rust, hard water scale and other substances that build up over time on tubs, showers, sinks, faucets and other bathroom surfaces. The cleaner's tough foam spray reduces the need for scrubbing, while its unique formula is safe on cultured marble, fiberglass, acrylic and most ceramic tiles and porcelain.