Don't waste money on ultrasonic RCMs

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. 

Those of us who bought LPs in the 60s knew (or found out) that even if you only use isopropyl to clean your stylus with an artist's brush you wait 15 minutes (and blow on the stylus a lot) before playing anything. Otherwise, sounds great once. After that.. irreparable hiss.
I was taken aback years later to hear that you use alky on CDs, but it works fine on them. Never on a vinyl record.

Interesting Youtube video, thanks for posting. One must keep an open mind. Try it on one PL that you don't really care about and see what happens over time.