Since 1882. Removes more from most hard surfaces. Mineral deposits. Oily residues. Rust stains. Everyday grime. Safe for septic system. Stainless steel. Tile. Porcelain. Ceramic. Fiberglass. Aluminum. Copper. Brass. Chrome. Glass. Works upside down. Great for toilet bowls. Bathroom. Kitchen. Vertical surfaces. www.barkeepersfriend.com.