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how large are these u-s cleaners, and do they safely use flammable solvents? Sounds like something ideal to de-gunk cosmoline from old SKS or AK's actions.

I still have an ultra-sonic cleaner in the drawer of an old drafting table. I haven't cleaned drafting pins since doing touch up on a pre-autocad map in the mid 90's. Actually, the last time I used it was an attempt to clean up some parts of a couple of Abu Garcia reels and other reels, of which some of the parts were nylon gears. They cleaned up quite well. I would think gun parts, even older parts with old hardened laquer would be better off soaked in a solvent though. My u-s cleaner only holds a few ounces of liquid so it is not made for very large parts.