Can also be used on other aluminum surfaces such as pontoon boats, tankers, etc. Duragloss® HD Aluminum Cleaner and Brightener, 32 oz Net Content, Liquid Form, Clear, Composition: Phosphoric Acid, Conc>=25%, Aqueous Solutions, Ammonium Hydrogen Difluoride, 0.1%<=conc<1%, Aqueous Solutions, Butyl Glycolether.
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