I purchased a couple of those "uncleaned coin lots" from
ebay a while back, and I had a heck of a time trying to get them clean...so I just dumped all 20 into a glass with plenty of mineral oil and left it for a couple months to try and soften up the dirt. about a week ago, I tried again to get the build-up / dirt off, and only some of it came off, but not enough to really identify anything...

Any ideas on what else would work? Should I just clean the oil off and try some peroxide? I really want to try and get them clean enough to try and identify some or alteast see some features. and one of the coins is pretty heavy, so I think it may be silver...keeping my fingers crossed
