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Harbor Freight sells ultrasonic cleaning machines at a very low price. The one I use is small, costs about $25.00 and is perfect for watch parts. After a little experimentation I ended up using straight Naptha that I can buy by the gallon from Home Depot. When the parts are clean I lay them out on a paper towel and let them air dry. I have even used it to clean the balance assembly (staff, balance wheel and hairspring) and it did a great job on that too.