A friend in SoCal was an ammo reloader and used walnut shell in a vibrator to clean his brass (probably not recommended for our brass)
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--- In STMFC@yahoogroups.com, "lnbill" <fgexbill@...> wrote:
Another gentle abrasive material are pulverized walnut shells. I remember seeing a show about repairing and upgrading Army and Marine HUMVEE's and they were using this material to remove paint. I have seen them advertised or carried by someone, maybe Harbor Freight.
Interestingly such things as fountain pens nibs are polished by being tumbled in walnut shells.