INDUSTRIAL STRENGTH ALUMINUM PRECLEAN Quickly and easily removes heavily-encrusted corrosion and stains. This amazing product is unmatched for its performance on Aluminum - also safe for use on painted & fiberglass surfaces. Leaves a wax-like protective coating when rinsed off. Proven to be 2 to 6 times more effective than Citric, Glycolic and Phosphoric acid. Safe for use on: Aluminum, Fiberglass, Glass, Tile Brass, Copper, Acrylics, Plastic. Will not dull Aluminum! Removes: Encrusted corrosion, heavy green tarnish, rust, calcium, lime, grease, oil and water stains, soap build-up. Not Suitable for: Chrome, Marble, some Granite, Jura, Travertine, and Terrazzo. Product Directions: 1. Spray full-strength onto surface; wait up to 2 minutes DO NOT LET DRY. 2. Scrub with nylon scrub brush. Rinse well with water. Repeat for heavy encrustation. 3. Follow with FLITZ Polishing products to reseal & maintain high luster. NOTE: Eye protection & rubber gloves recommended.