I use treated corn cob. In the last year I've been washing the fired cases before polishing. The media lasts far longer and the polishing goes quicker.
I de-prime first. Then they go into a bucket of water with Dawn where they get agitated by hand occasionally while they soak for a few hours. Then a hot water rinse, drain, and onto a towel to dry (typically overnight).
The process isn't good if you are in a hurry, but I find it works well and costs less (media lasts longer, less tumbler wear, and less electricity).
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