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I found that using a tumbler I bought at harbor freight ( dual tumblers ) and adding play sand help remove rust from quite a few things. Drill bits, easy outs, punches, and many other things that would fit in to the tumbler. All I did was fill container half way with sand added my drills or easy outs and ran for 8 hours. Most all the rust was gone. If you use this method have a scale handy and read the tumbler weight instructions. By not using a scale you could ruin the tumblers as they become off balanced. Hope this adds to getting rust out of tools.