I finally took the plunge and bought myself a tumbler and some SS pins to clean brass. I had some nasty brass that I "inherited" at the Vogel class. It came complete with sand, silt and corrosion and no amount of time in the vibratory cleaner was going to clean it up. (Believe me, I tried.)
It's a slow process but man oh man, does it turn out some beautiful brass. All the nasty stuff on the interior of the case is gone! Even the primer pockets get cleaned out nicely.
I just didn't want to launch that crap down the barrels of the guns.
Another hobby within a hobby.