Many people who reload their own ammunition use a vibratory or rotary tumbler to clean their brass cartridge cases.
Frankford Arsenal Quick-N-EZ 110V Case Tumbler Kit with Sifter for Brass Cartridge Cleaning and Polishing for Reloading,Blue and Grey : Gunsmithing Tools And Accessories : Sports & Outdoors
Brass Cleaning with Stainless Media within
Hornady M-1 Case Brass Tumbler
Taking a Tumble: Winter is the Best Time for Reloading Brass - American Handgunner
Inexpensive Brass Case Cleaning - The Reloaders Network
Brassed Off With Your Dirty Brass? Henry Krank Guide To Cleaning Brass Cases
Wet tumbling with sanity - Reloading - Oz Gun Lobby
Is it nescessary to clean brass?
Shiney Savings: Wet-Tumbling Cartridge Brass on a Tight Budget « Daily Bulletin
Reloading: Using a Tumbler to Clean Brass Cartridge Cases