Bar Keepers Friend is a multi-surface cleaner and polisher. A mildly abrasive cleaner that removes rust, hardwater deposits, and metal tarnish. The active ingredients are biodegradeable. Cleans and polishes stainless steel sinks and cookware. Leaves a smooth polished surface and brilliant shine. Works on porcelain, copper, tile, brass, fiberglass, chrome, copper, plastic, and marble.