Cleaning is not required but there are reasons I do it. First it keeps the abrasive crud out of my dies. Second is for looks, I personally clean all my brass for these two reasons.
What I use to clean is Lemishine and can be found at WM. I mix it with a little of dishwashing soap then allow the brass to soak about 24 hours. After this I dry the cases then tumble them for a few hours. At this point I know they are clean so I start processing them. Normally after processing I put then back in the tumbler if I used case lube to remove it.
In my tumbler I use very fine walnut media that I buy from pet stores for about $1 a pound. It is fine enough that it doesn't get stuck in the flash hole of the case. In the walnut media I add a few tsp's of NuFinish to give a nice shine also.
It may be a little overboard but it works for me.
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