Adversam, you don't need to spend a lot of money for an ultrasonic record cleaning machine. The hottest thing on the market today is the Degritter. However, they refuse to prove their claim of why using an ultrasonic frequency of 120 kHz/ 300 watts cleans better than other frequencies. I need more than sales & marketing talk before spending the kind of money they want for their machine. I've communicated with many manufacturers of ultrasonic cleaning machines used in the medical field and in the manufacture of semiconductors. All the responses I received indicate that 40 kHz would be sufficient for PVC or vinyl records without harming them. The cavitation produced at 120 kHz does, indeed, produce smaller bubbles than 40 kHz (a standard frequency). However, it's not the bubbles that do the cleaning. It's the power of their implosion (i.e. cavitation). Forty Hz would be sufficient, more powerful and will not harm your records, as long as you don't clean them more than necessary (i.e. once, as long as you practice other proper care & maintenance habits). Check out CleanerVinyl.com. You can put together a good, effective system for as little as several hundred dollars (US). A system like this is, admittedly, less convenient than Degritter, AUDIO Desk Systeme and other such systems. You'll have to do a little more work but it will save you lots of money. If and when Degritter can prove that 120 kHz is more or, at least, as effective as 40, 60 or 80 kHz or oscillating frequencies like these, I'll buy one.