Flitz Brass and Copper Polish Remover - Powerful Organic Formula Safely Removes Rust, Stains and Oxidation + Cleans Brick, Glass, Aluminum and More - Made in the USA Before Polishing - Remove Tarnish with This Organic Formula That kills corrosion. Works instantly! It's not an acid! Simply spray and rinse with water and you're ready to polish. Not suitable for chrome or patina finishes. Instantly removes heavy tarnish without rubbing. Indoor or outdoor use. Formula of natural organic salts. Safer than traditional acid-based cleaners. Simply spray and rinse. The product will continue to work on the surface until rinsed. You MUST rinse the surface with water after application and neutralize the formula to prevent it from invading the surface itself.