Thanks for sharing this information. I personally have an ultrasonic cleaner (standard, inexpensive VEVOR model), and that works very well for 90% of my LP's. There are a few (interestingly some sealed, mint LP's) that despite U/S cleaning, and manual scrubbing with a MoFi brush and cleaning solution, there are still crackles, but no pops. For these I'm considering just sending them off the Perfect Vinyl Forever for an Archival 4.0 cleaning. Has anyone had experience with this?
Thanks.