Don't waste money on ultrasonic RCMs

Because alcohol cleans well and has no effect on vinyl. I used VPI and Audio Desk.

Thanks for my chuckle of the day.

Because alcohol cleans well and has no effect on vinyl

Pretty sure that alcohol releases plasicisers and bonding agents from the LP depending on how strong it is...

Fremer has an article on ultrasound-based RCMs and a new one, here--> https://www.analogplanet.com/content/if-charles-kirmusss-record-cleaning-machine-and-regimen-correct... The claim to fame for this new model is alteration of the ultrasound incident angle relative to the record surface and use of a lower frequency. As I remember this aspect of physics, that's hooey. Here are the salient claims: "...he's set the frequency to 35kHz, which he claims is significantly lower than most of the others....Kirmuss says the "direct hit" and higher frequency of the other machines damages record grooves and "shaves off" high frequency information."

Ri-i-ight. And then you can spend all the money you saved on cryo-ed cable crayons.

I see tons of people that claim alcohol has no effect on vinyl. I've tried lab grade 99.8% pure IPA and I can see the vinyl change when it hits the surface. The color changes from a deep black shiny color to dull gray- black. Has anyone else observed this? I've tried two brands of IPA. And it made the LP sound worse- more background hiss than before use. I must be using the wrong stuff??
I use an inexpensive RCM instead. Record Doctor V.  It does a really good job if you clean and then rinse with distilled water.