In my experience with empty cases picked up off a muddy range, you cannot get brass clean with a tumbler when it is coverd with "mud, dirt, and clay."
I had to wash and dry the empty brass before it was possible to put them in a tumbler and finish the job.
If it were mine, I'd spread it out on pavement and clean it as gently as possible with a soft water spray, then get a soft rag and start wiping.
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Science plus Art
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