I now use a Chinese 10L US cleaner and a Vinyl Stack. My process:
Spin Clean, as a pre cleaner to dislodge most of the dirt etc on the LP, blot dry.
US clean using Rushton's formula, at 1/3 rpm / 5 rev in 15min.
Rinse.
Nitty Gritty vacuum dry. Then inserted into a new MoFi inner sleeve.
I change all fluids after 20 LPs.
There is a considerable amount of debris in the Spin Clean tank after a cleaning session. There is *also* a surprising amount of debris in the US tank after a cleaning session, representing debris *not* removed by the Spin Clean alone.
Damage is still audible. The background of undamaged LPs is now lower than the background of my system. Amazing to hear music decay into nothing, or an arbitrary cutoff where the engineer cut the signal. The low level Shhhhh/Woosh sound is removed from undamaged LPs. Transient response and low level ambiance clues are significantly improved. I have noted an increase in pops tics on some LPs as I get closer to the record label indicating some tweaking of my process is needed. Overall US *is* a significant step forward.