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If you don’t want to mess up your ultrasonic solution – and you have a copy of the Chicago School of Watchmaking course, they present a seven dip manual cleaning process that you could use to clean WD40 and the like. I use Naptha in place of the degreaser that they specify (that course was probably put together before the advent of the EPA), and you can still get the green soap that they specifiy. In reality, you don’t need to do the seven dip process and can probably get by with Naptha/Soap-Amonia/ALchohol/Water that should desolve just about anything. It’s cheap and just takes a little time to get things clean. Just remember not to use the alchohol on shelaced-in jewels.