Oxidized Wheels

We have bought some old aluminum alloy wheels and would like to clean them up and polish them. I know semi companies use an acid to clean wheels.

Any idea on which acid and which strength it should be?

Ed. note: yes, some companies clean aluminum with hydrofluoric acid, which is a very dangerous process since hydrofluoric acid frightens experienced professionals. But for real shine, alloy wheels must be mechanically polished and buffed, not dipped in a magic potion, Peg.