Ultrasonic Velvet Vortex here & DIY fluid. IPA+ Distilled water+ Ifotel at 30 degrees does a great job.
I've come from using Knosti with 2 baths, but there was often white crud left on the needle. Ultrasonic's reduced surface noise I often double take I've dropped the needle!
https://velvetvortex.com
Is that the one from WAM that I was thinking of? Can you tell me some more? I can see the appeal of ultrasonic cleaning but have zero experience, I was aware of a DIY approach on WAM that was nothing like the several £k they sell for elsewhere ... do tell!