Cleans And Fluxes At The Same Time. Blended To Clean Surface Oxidation. 100% Lead Free. Effective On All Metals Except Aluminum, Magnesium, And Stainless Steel. No Pre-Cleaning Necessary For Clean Sweat Copper Fittings, For Other Applications Clean Excessive Dirt And Corrosion. Do Not Use On Electrical Parts. Use With Solid Wire Solder.