Why not just buy a tumbler? Frankford Arsenal tumblers are less than $75. There's tumbler dust to worry about, just do it in a ventilated area.
This. Effective, inexpensive and relatively quick.I've done the ol hot water, splash of vinegar, salt and dish soap trick. Just agitate em around every few minutes and thoroughly drain and rinse. It does the job, but you might overhear guys at the range talking trash behind your back about how ugly your reloads are