Zep Shower Tub and Tile Cleaner 32 Ounce ZUSTT32 (Case of 4) Breaks up Tough Buildup on Contact. Shower, Tub & Tile Cleaner 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 cleaners 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.Zep Shower Tub and Tile Cleaner 32 Ounce (Case of 4)PRO GRADE ACIDIC SOLUTION: Makes Cleaning Easier By Breaking Up Rust, Soap Scum, and Other Tough Buildup On ContactNO SCRUB FORMULA: Penetrates Stains From Rust & Hard Water