elcid,
I used nothing but wet N dry sand paper, Mothers aluminum polish and elbow grease. 200 grit followed by 400 followed by 600, 800, 1000, and 1200 followed up with the Mothers. It takes a while but the results are pretty good. I used WD 40 to wet the paper and used lots of paper. As soon as it started to load up, I got anew piece.
ED