For another point of interest, today I have 4 audio friends over to listen to music. One wanted a demonstration of the ultrasonic cleaning regimen. Two others both had ultrasonic cleaning systems and said they had no interest in a demo, but were polite enough to sit through it for the one. The one coming for a demonstration brought vinyl already well cleaned to his satisfaction using his multi-step enzyme cleaning process (similar to the one I've used for years before changing to my current regiment).
After listening selections from to his already cleaned LPs, I put them through my US regimen. Then we re-listened. And everyone agreed that all four records sounded better in very noticeable ways after the US cleaning: greater openness of the soundstage, more extended highs and harmonic overtones, deeper tighter bass. We also listened to some records not previously cleaned to see if we heard the same sonic results. The one who wanted the demonstration is now convinced he needs to shift his cleaning process to ultrasonic plus the cleaning solution in the tank, plus rinse.
More interesting, the two who already used ultrasonic and didn't need a demo heard significant improvements they were not hearing from their own US processes and are now planning to make some changes based on what they heard here.
I share this story because there are many people using some variation on ultrasonic cleaning. For me, this was some validation that there is more to getting great results from US cleaning than just getting a US tank. As I learned in my own experiments, and as these existing US cleaner users heard for themselves, it is the combination of factors: the right cleaning solution in the tank, keeping the solution in the tank very clean by filtering between batches of records, heat in both the tank and the rinse, rinsing, and ultrapure water second rinse. It all adds up to improved results.
Cheers!