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Walnut treated or otherwise will clean brass well. Corncob media will clean and polish the brass. It may take longer to clean them than it takes walnut. Additives can be added to both to make them work faster. Additives are not really needed but some prefer them. As to corncob media I prefer 20/40 and I get mine in 40 pound bags from Grainger. It is small enough to not get stuck in the cases. 40 pounds will last a very long time.
Getting any crud off the cases prior to loading is what you are looking for at a minimum. Making them look pretty or shining like a mirror isn't needed to make good ammo, but than again they are easier to find on the ground after shooting. If you are shooting from a revolver, finding your brass shouldn't be a problem. A lever action rifle might be different.
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