Since 1882. Is a Soft Liquid Cleaner with Many Cleaning Uses: Glass Ceramic Cooking Surfaces: Safe and effective on cool or warm (not hot) surfaces. For stubborn stains, coat surface for several minutes before rubbing. Stainless Steel & Porcelain Sinks, Tubs and Tiles: Removes hard water mineral deposits. Chrome, Copper & Brass: Removes metal tarnish. For brushed surfaces, polish in the direction of brush lines. Once tried, always used. A soft liquid cleaner with many cleaning uses. www.barkeepersfriend.com.