On Thu, 10 Oct 2019 05:35:52 -0700, whisky-dave wrote:

Isn't that similar to how ultrasonic cleaners worked in that the
molecules of water vibrated and dislodged the dirt, they were used for
some circuit boards but mainly for jewlery, Maplin had one for sale
years back.

Actually, microscopic bubbles. And they are still around. Mine works well
- got it from CPC.

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