I use a vibratory tumbler, corncobs, and a half cap of NuFinish polish. This will last me a fair amount of time before I will dump like half and put in fresh media. Works great though I do agree it doesn't do a great job on the insides, but I never have issues running them through my dies. Only crappy part is the time to fish them out, I want to get one of the media separators but I feel that opens me up to a lot of media loss.
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