I have tried every possible method that I could find on the web for cleaning aluminum, tungsten, filler wire. Nothing has seemed to work. I\'ve tried looking for leaks in the argon line. I\'m getting decent welds but there is gunk in the welds for sure. I\'m worried about overall strength of the welds. Does anybody out there know of a tried and true method for cleaning aluminum, tungsten, filler etc. that is sure to work? If I can follow that method and still have problems It could possibly be a problem with the machine. Any help would be much appreciated.Preweld cleaning requires two operations: oil/grease removal and oxide removal. As below, remove oils and greases first, then remove the oxide. Don’t reverse this order. Take the following steps before welding aluminum: 1. Remove oil, grease, and water vapor using an organic solvent such as acetone or a mild alkaline solution like a strong soap. You may also use citrus-based degreasers, but be sure to rinse and dry the part before welding. 2. Remove surface oxides with a stainless steel wire brush (used only for aluminum) or strong alkaline or acid. Many welding suppliers sell oxide-removal solutions in spray or squeeze bottles for local application. Exercise extreme care when handling these solutions, and again, rinse and dry the part before welding. 3. Assemble the joint. If it won\'t be welded immediately, cover the joint with brown Kraft paper to prevent dirt and grit in the air from getting into the joint. 4. Keep the aluminum dry and at room temperature. 5. Weld within a few days. Clean the joint again if it isn\'t welded within that time. Good luck!!!Other related question