Walter E-NOX CLEAN is a highly concentrated gel formulation cleaner that removes tarnish, rust, and mineral deposits and brightens surfaces. Outperforms abrasives while saving time and energy. NSF category A3, registration #142614. This product features are: it is nonflammable, solvent-free, VOC-free, safe for use on aluminum, chrome, and other non-ferrous metals, the gel sticks to vertical surfaces, it can be diluted up to 1:40, is biodegradable, free of nitric and hydrochloric acid. It can be used on aluminum, brass, copper, and stainless.