Originally Posted by Fabrik8

Yeah, this is the right section.

Are they currently powercoated or painted? If they're painted, you have lots of options. If they're powdercoated, not nearly as many.

If they're painted you can use lacquer thinner, aircraft stripper, sand them by hand, get them media blasted, the list goes on.

If they're powdercoated you can use aircraft stripper or some rather nasty chemicals, aircraft stripper being the preffered choice. You can get them media blasted but media that will remove powdercoat with any speed will also tend to be a little too harsh for the metal underneath. That may work perfectly fine if they're getting painted or powercoated again after that. The aircraft stripper is something that you can do yourself at home though.