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I use walnut blast media from Harbor Freight to clean cases. About 3 hours in the tumbler. Then I put them in a second tumbler loaded with corn cob media and NuFinish car polish. Walnut does a great job of cleaning, but they come out dusty even using dryer sheets. The corn does a good job of polishing and they come out dust free and ready to be sized. Zoro Tools is a great source of bulk corn media by the way.
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