RE: https://oldbytes.space/@bitsavers/116705326254049944

I just hose them down with 99% IPA, then scrub them with a paper towel and a toothbrush. That gets the flux and grime off no problem.

@mos_8502 This is the way.
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@mos_8502 I figure if Dawn dish soap and water is good enough for oil-slicked birds, then it's good enough for my repaired boards.

Also can't think of a time I'd ever think it OK to put piezo-parts in an ultrasonic bath. That's like setting up wine glasses in front of opera singers.