Sorry for the late reply--it's been a busy time.
White Equalizers specified the cure for noisy pots on their units is 20 turns, stop-to-stop (full left, full right is 1 turn). For the record, this would not fix the White EQ units that had the notorious bad run of Allen Bradley pots which were all seemingly incurable after a while. But this cure has worked great for me over the years. Occasionally a pesky pot would require 30 or even 40 turns, but most will 'calm down' in their bad behaviour.
I ran an old Neve-based complex for 13 years: 2 - 8038's (one 32 in, one 60 in created from 2 consoles). Our primary problem there was the eq in/out switches, phase flip switches, pan switches and channel cut switches (although we built new 8 individual sends/channel modules which also replaced the channel cut switches); the dual concentric frequency selector switches were far less trouble by comparison.
I had the opportunity to see/hear, on a daily basis, what worked and what didn't for over a decade. When we were building the big console, the owner decided that ultrasonic cleaning was the way to go. The ultrasonic cleaning went on for days (LOTS of modules) and, when finished, the modules that had been ultrasonically cleaned performed poorly--I hope you have better luck.
Even though the techs, when they heard this, would 'shriek in horror' as they told me how it didn't work, the best performing treatment I ever did was cramolin red spray, exercise the switches, then flush with a spray degreaser/cleaner, then cramolin blue spray. I always used just the smallest possible squirt from the cramolin spray cans. This made the consoles MASSIVELY more reliable and trouble-free and would last around 6 months. Unfortunately cramolin is no longer made. If I had to do this again today, I would try Caig Pro Gold, exercise the switches, flush with a cleaner/degreaser, then a very light spray of (alcohol-diluted) Stabilant. We really never had much trouble with the Penny & Giles pots, pan pots, etc. When panners got noisy, the White EQ treatment cleared them up. Good luck.