Maybe a ridiculous question, maybe not

Hey, Tony, how's Andy Kaufman?

Don't use toothpaste!

I vote for worth a try, similar idea as megasonic clean and should be very effective in cleaning deep down in the groove. semiconductor industry uses megasonic to clean wafer all the time.

Only if the record has just eaten. Brush after meals for better performance.

I might add, if you do it, make sure you're using it on a revolving record.

Try it on a worthless lp and let us know. It seems reasonable that it would work. I used to scrub pretty aggressively with my VPI brush at times with no negative effects.

I'll vote for riduculous if you're taking a survey.

I have a Signet stylus cleaner that "vibrates" at a high rate. There were several companies in the past that made these.