Vibratory Tumbler

I use one to clean brass before reloading ammo. Corn husk works ok, crushed walnut works on badly tarnished brass a bit better, but leaves a dull finish. I also use http://www.dillonprecision.com/#/content/p/9/pid/23665/catid/8/Rapid_Polish_290__Case__20_pc__ this with the corn. I know there is media that is much more abrasive than these 2 available.....