Nuttin'! A while back I accidently mixed some walnut shells (lizzard litter) with some corn cob (
http://www.drillspot.com/products/49...bs_blast_media), and it worked quite well. Now that's all I use and I get clean, shiny brass. Occationally I'll drop some mineral spirits into dirty (?) media, but I ferget mostly. Works for me and my Lyman wobbler...