I stumbled across this nice article today:https://thevinylpress.com/the-curious-case-of-record-cleaning-in-the-quest-for-sonic-perfection/
It's a seemingly well researched and detailed account of the history of the idea, and eventual implementation, of ultrasonic cleaning for LPs. Thought it might be of interest to some members here.
I've ordered a Degritter Ultra Sonic Record Cleaner which is supposed to ship November. Looking really forward to it, as I have an ever mounting pile of LPs that could really use cleaning.