JWM, seems to me, you can tell that the transducer is working based on the physical and audible improvements after cleaning.
After listening to a few noisy albums at your house before cleaning, then hearing them after cleaning, everyone in the room agreed, there was a HUGE improvement. Not only that, the albums looked so shiny and squeaky clean!
My only concern, after washing several dirty albums, seems like the water in the holding tank would get pretty nasty, contaminating future albums being cleaned. I guess there's supposed to be a filter inside but I'd like to see more info on how it works and how effective it is.
Later Bro