I just started to clean up the Ful-Vu-Lite for the Miller Meteor, and found that they were in worse condition than I remembered. If the following series of pictures, you can see one side that is after it was washed with soap and water. The other side, I started sanding the finish with 3/0 emery cloth, since the aluminum is pitted and badly oxidized. I have heard about some acids that will remove the oxidation, but it won't help the pits, so sanding is the best method. If I were to throw caution to the wind, I might have started with something more aggressive, such as a 240 grit wet or dry sandpaper, and then work my way up to the finer grits. The reason for the 3/0 emery cloth, is because I had it in the garage. It is important to sand in multiple directions, so you don't create any valleys and ridges. Once I have the metal sanded to my satisfaction, then it is onto the polishing wheel using a multitude of different rouges, until I get the finish that I want.