I use one to clean the parts of my Sparrow. First I give the parts a soak in a penetrating oil, Marvel Mystery Oil is under $20/gal and seems to work nearly as well as Kroil did. Then I give it a run in the ultrasonic with hot water and my wifes dish washing detergent. Finally scrape off the remaining lead bits.
Makes the final scraping a lot easier than the penetrating oil alone.
The ultrasonic merely speed up the damage. Aluminum and alkali solutions don't get along.
Once I'm sure there is no fire hazard, I may try penetrating oil in my ultrasonic instead of plain soap and water after a penetrating oil soak, which could speed things up a lot.
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