I have used the vibrating tumbler and it will do a great job, just like it does for dirty brass. youve just got to figure out what kind of media(cob or walnut) and what cleaning/polishing agent is best, which depends on how dirty/rusty and pitted it is. one media is extra strength cleaner the other more of a polisher. as for the eddge, it will have to be re-honed anyway. I would be careful of any metal parts inside the tumbler and i would tape or cover them in some fashion. have fun