Yep, you can polish them up, Few different things you can use, Wet & Dry sandpaper (used wet with some soap), 600 grit then 1200 grit, you could use Scotchbrite pads, course, medium then fine, you could use Steel wool, i've also had success with normal Brillo soap pads used wet (one of these is the equivilent of 1200 Wet & Dry), once cleaned up using any of these you can go over them with Metal polish, Autosol works well, as does Brasso or T-cut (though these are less abrasive), finish them off with car wax to protect them.