Multi-purpose copper & brass cleaner and polish Copper-tec is an easy-to-use gentle cleaner and polish which removes tarnish without any scratches. Copper-tec will remove the toughest tarnish and provide instant cleaning action. Copper-tec will provide anti-tarnish protection and a long-lasting luster. Copper-tec will bring out the original beauty of your copper and brass. Copper-tec is biodegradable and safe for the environment.