Aluminum Polishing

I'm trying to polish a fuel tank off a kenworth to use as a sliptank, but am not getting the results I want. Problem is the tank is a bit pitted from stones.Does anybody know of a company that specializes in this, preferable in the Red Deer area. Thanks for any help.

I have the boys polishing the tanks and rims on their wireline trucks right now and they are using flitz metal polish with those "mothers" polishing balls on the drill. It takes alot of elbow grease to get a finish but works well. I love hard work, I can watch it all day long