Reloading: Using a Tumbler to Clean Brass Cartridge Cases
Cleaning Brass Cartridge Cases in a Tumbler. ... mix in a little polishing powder, add your brass casings, close the lid, turn it on and come back in a few hours to inspect your clean brass. Your selection of media is determined by the brass that you will be cleaning. If the brass just needs a light buffing then crushed corn cob will work great.