Walter Surface Technologies Bio-Circle® Stainless Steel Cleaner/Brightener, Heavy Duty High Strength, Series: E-NOX CLEAN™, 5.2 gal, Yellow, Liquid, 1.05 to 1.15 g/mL Specific Gravity, Applicable Materials: Aluminum, Brass, Copper and Stainless Steel, 0 to 1 pH, Composition: Phosphoric Acid, Benzenesulfonic Acid, C10-13-Alkyl Derivs, Sodium Salts Alcohol, C12-14, Ethoxylated