Great forum topic! I recently learned that on simple surface rust on certain platings especially chrome you can use wadded up tin (aluminum) foil and rub off rust. It actually worked pretty darn good and I was surprised.
I think for making the bar or any other similar metal really come out good, the scotch bright method would work or the wet sanding method going higher on grit up to 2000 or so to get that deep polish.
Do you have to finish off with some kind of sealant though or wax?