I prefer ground walnut or brown rice. Corncob tends to stick in bottleneck cases for me. You can get ground walnut at pet supply stores as "lizard litter" a lot cheaper than from gun stores.
I add a tablespoon or three of "Bon Ami" or "Old Dutch" to a tumbler. Polishes faster and longer with it. Don't use Ajax. That's too aggressive and can scratch your dies.
Whatever you use, it's time to change it when polishing your cases takes too long. I might get a dozen batches polished between changes, but can't say I have ever counted.
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