When I last used a vibratory I used lizzard bedding, it's finer than either corn or walnut and doesn't get stuck in the flashholes. For the last several years I've been using a Frankford Arsenal tumbler with hot water, Dawn dish detergent and Lemi-shine. Gets the brass clean enough to suit me. At the end of three hours I rinse and place on cookie sheets in my oven at the lowest setting (170) for 20 mins..
