body blasting!!!

Well, since everyone else seemed to go off on different tangents in response to your question, let me give you an answer.

You are looking for what media to use... not what size compressor and what not.

For what you are wanting to do, clean metal without sheet metal damage... go with either walnut shells or plastic.

Stay away from sand, black diamond, and glass beads. Glass beads would work fine, but they are pricey unless you have a way to gather up the media and use it again.

Also... run an inline moisture separator to keep the media and metal dry.