Whichever machine you choose, you should use some kind of surfactant. I use Tergikleen.
The Audiophile Man basically wrote a book on it. Okay, not a book but a very detailed step-by-step guide. (theaudiophileman.com)
Ultrasonic record cleaners
I have a modest lp collection, mixed bag of original college age purchases, used records before the current renewed interest, and some newer albums to replace some older issues from the p mount needle days. Have a vpi 16 machine and audio intelligent form 6 fluid. I’m not finding a significant improvement on my noisier issues. The price of ultrasonic cleaners have come down to a price I would consider. Appreciate the experiences of those who have purchased the ultrasonic machines, are they superior to my vpi and are the less expensive models effective?
TIA