I've been using ultrasonic cleaners for 35 years for work(dental laboratory) and probably started using one for gun cleaning long before they became popular. I also use Simple Green for cleaning everything from cartridge cases to shotgun actions. Don't leave brass cases in too long as the solution will heat up and they'll tarnish. Simple Green will remove all old oil, grease and crud and reveal case colors that you didn't know were there. If you're shopping for a used ultrasonic one simple test to see if its still working is to put a piece of aluminum foil in the solution and run it. If it punches little hole in the foil its working.
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Eric M. Baker, DTC(FMF), USN, Retired
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