Easiest way to clean brass is to dry tumble. Add polish of choice, toss in brass, dryer sheet and let it run. Separate media with rotary cage and you're done. I usually use walnut media, but sometimes add some corncob. A dollop of NuFinish car polish is pretty inexpensive. If not shiny enough to your liking, let 'er run some more. No rinsing, no drying, no de-capping.