For the last 4 years I've been using this vibrating brass cleaner: http://www.amazon.com/SmartReloader-SR787-Dream-Case-Tumbler/dp/B004ZIO3W4 It works real good with corncob media with a little metal polish added. Takes 2-4 hours to make very shiny brass. Still works fine after nearly 50k (Yes, I shoot about 12k a year) cases cleaned. Last week I took the plunge and bought a Thumler's Tumbler: http://www.amazon.com/Model-Heavy-Duty-Rock-Tumbler/dp/B000BUXY0W It uses steel pins in water with a few drops of dish detergent and a half teaspoon of "lemishine". You pop your primers before cleaning your brass in the tumbler, and it cleans the inside of the case AND the primer pocket. The brass comes out looking like you just bought it from Starline! If you cheap out and get the vibratory cleaner, you need to keep corncob media stocked, and you need to clean your primer pockets by hand, AND the insides of your cases will get cruddier and cruddier over time - Sometimes the flash-hole will get partially plugged. Yes, the tumbler is expensive, but you only buy pins once, they last forever, and if you collect a pile of range brass and tumble it, it's damned easy to sell at a premium price. And you can use the tumbler to polish rocks.