Bar Keepers Friend cleanser and polish is the most widely-recommended cleanser for stainless steel cookware. It also removes stains from porcelain and stainless steel sinks, ceramic cookware, plastic dishes, stove tops, and countertops, and may be used in the bathroom to clean and shine tile grouting, sinks, baths, toilet bowls, and chrome fixtures. It is famous for removing rust, metal tarnish, mineral deposits, and stains from most hard surfaces. The cleanser and polish can be used to remove tarnish, deposits, residues, and stains from most non-porous, hard surfaces, including: stainless steel, copper alloys (including brass and bronze), aluminum, ceramic, porcelain, glass, and Corion. Being a powder, you can make either a thick paste or a watery slurry to match different surfaces and stains. A paste will be more acidic than the slurry; more acidity is needed when dealing with mineral deposits or rust stains whereas a watery slurry is ideal for removing tarnish from a stainless steel pan or sink.
Because the cleanser and polish is acidic and contains polishing compounds, it may etch or dull delicate surfaces. Before applying to fibreglass, plastics, anodized aluminum, or brushed metal surfaces, such as appliance exteriors, test in a small, hidden area first. Do not use on cast iron, granite, marble, wood, fabric, leather, painted surfaces, mirrors, gold, or silver (except sterling silver). Do not use where rinsing thoroughly is difficult or impossible. On brushed stainless steel, rub gently in the direction of the brush lines.