Safe + strong: Safe for gold plated finishes, granite, living finishes, fire clay sinks, oil rubbed finishes, clear coat, lacquer, fiberglass, powder coat, polyurethane, marble Corian® and more. Will not dull polished metal. No scratches or residue left behind. Use on faucets, fireplace doors, sinks, outdoor lighting fixtures, tubs, showers, vanities, and more.