So I had some 9mm brass that was dirty with mud. Washed it off with water and dried them on a towel then tossed them in the tumbler with corn cob media. Of course the wet inside of the cases collected and held the media as it swelled with moisture. Lot of work digging out a hundred 9mm cases.
Well, now you know. I've done similar things.
A long time ago I went cheap and used coarsely ground corncob animal bedding for tumbler media. Had a bunch of it get stuck inside .223 cases. Was no fun to clean out.
"As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven. "