I’m also interested but don’t have own experience unfortunately. I spoke to a few experts however and got different feedback. On the one hand ultrasonic cleaning can help where normal cleaning machines can’t, on the other hand, I heard that it’s most important to use microfiber for mechanical cleaning and that cleaning without mechanical implication isn’t comparable to what you can accomplish with it. The conclusion was to have both (two machines).
I definitely think groove distortion is not caused by a record cleaner, it’s just a question of how the record was cut and how critical the music is for distortion, of the record condition and of the cartridge’s ability and adjustment. The two latter (if optimal) usually make groove distortion an absolute exception.