I used electrolysis on a recent project, it worked great, removes rust, grease, and paint. If you have a battery charger already you wont need to buy much else. Just google electrolysis rust removal and you will find lots of info, oh and some sites will recommend stainless steel, but for reasons of hazardous waste you should try to avoid it.

Oh and try to post some pics, everyone around here likes pictures of these projects before they start.