Steel
HEres an old indian trick, I helped a guy with a hydrogen car, we found this out by mistake.
I have used it 2x on gas tanks , insulate around the steel so it won't arc out by the capput the steel strap in the fill hole and clamp the other lead to the gas tank.
http://www.videojug.com/film/how-to-remove-rust
or get phosphiroc acid at a hardware store for about 20 $
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Chrome
also wd 40 and steel wool for chrome
ort a aluminaum foil ball and coke works well to

