An important step in reloading is to clean your brass. I've been using a simple, inexpensive method; namely, wet tumbling using a common Harbor Freight rock
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Using a Rock Tumbler to Clean Brass for Reloading
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POLISHING BRASS: HOW TO / WHATS NEEDED / RELOADING by At The Ready
I don't have a tumbler right now, so I've been cleaning my brass
The Lyman Cyclone Rotary Tumbler – from Hannam's Reloading by
Super Clean Brass Without Breaking The Bank
Play With Your Food: Clean Brass With Rice :: Primal Rights, Inc
Wet tumbling brass with the Harbor Freight Rock Tumbler
The WalMart vibratory brass cleaner.