So, with my new, updated ultrasonic LP cleaning process, I do notice a significant improvement in sound quality. The updated process has made my slightly noisy LP’s (static, pops, etc) almost silent, with only an occasional static pop noted. The LP’s that I formerly couldn’t even listen to because of the surface noise (mostly static-type noise) are now very listenable; although there is still noticeable surface noise, it is greatly diminished (I would roughly estimate a 75% drop in surface noise). Overall, it’s quite an improvement, and I’m beginning to wonder if longer, and a few more cleaning cycles may even clean up those troublesome LP’s that were formerly unlistenable. . .
Thanks to everyone for their input, and thanks to @antinn for sharing his knowledge. I don’t suppose that there’s a hard copy of your book available for purchase? (I generally don’t like clicking on links to "download" items because of virus and malware risks.)