Most of the Component suppliers or manufacturers make or sell a vibrating tumbler brass cleaner. They are all pretty much the same and most only come with a 1 year warranty on the motor, so it would be reasonable to think that is the weak point. Mid-South does warrant theirs for 3 years motor included. Walnut and corn cob will do most of your cleaning, but if you find brass that has been out in the elements for more than a year, the brown corrosion will probably need a more aggressive media. Brass does not need to be pretty to function well, just clean.