I'd suggest getting a gallon jug, putting in a little Mr. Clean or other detergent, brass and a whole lot of water. Shake like no tomorrow, let it soak, rinse, dry and load. Brass doesn't have to be shiny, just clean to keep from buggering up your dies. I've a buddy that's a High Master and he doesn't own a tumbler, he uses the routine above. If you want to polish it and can't get a tumbler, get a coffee can, fill it up with rice and your brass and drive it around in the back of you truck for a week. At one point in my life, I shook the can while watching TV and aggravated my wife all to you know what.