[CamarosRus]

I have NOT tried the below myself, but read this elsewhere on net......

"A mixture of Chromic Acid and water will clean most aluminum surfaces up really well if used correctly. It will also help to protect the aluminum from corrosion too. Go to a chemical supply house and buy some Chromium Trioxide Chrystals. When mixing, ALWAYS PUT ACID INTO WATER and NOT the other way around! Be sure to wear eye protection such as and protective clothing of rubber or plastic when mixing any acid solutions together. Then put 7.5 fluid ounces of water into a beaker and carefully pour in .4 ounces of Chromium Trioxide Chrystals while stirring with a wooden stick or glass rod. This solution can be used on freshly machined aluminum surfaces or to treat mild corrosion. For areas of heavy corrosion, take a piece of plastic (plexiglass) and scrape the excess corrosion off and not damage the areas that are not corroded. The surface areas must be clean and free of oil or dirt before applying the solution. This solution mixture has a shelf life of about 30 days. Be sure not to dip in dirty cloths or dirty cotton balls into the solution repeatably as the removed corrosion absorbed in these will have a tendancy to kill the power of the fresh solution. When applying the solution onto the aluminum, allow the acid to stand for about 2 to 5 minutes or until it has stopped working (or bubbling), wash off with clear cool water to remove remaining acid and dry with an air hose or wipe clean with a clean cloth until dry."

Chuck S