When I had the Audio Desk, I reduced the amount of factory fluid based on input from other long time users. I could still see the effects of that fluid residue afterwards- water spread across the disc fairly evenly, as if there were still a surfactant of some sort present, breaking the surface tension. Theoretically, the ultrasonic cleaning as a finishing step, without the contact of potentially polluting brushes, or static inducing vacuum wands, is best. However, I still got better results on some records by point nozzle drying the ultrasonically washed, but not forced air dried, record. One can do this without spending a fortune on machines- DIY ultrasonic plus used Loricraft will get you there.