contact cleaner: spray with the skinny hose thingy
https://www.homedepot.com/p/WD-40-SPECIALIST-11-oz-Contact-Cleaner-Quick-Drying-Electric-Equipment-C...
spray, twirl the dials a few times, wait a minute, repeat
it is fast drying, but I blow before and after with compressed air.
If one control needs cleaning, it might be time to take the covers off, (perhaps the front panel off if you are handy and have the tools) and do a decent job of cleaning with better access to the switches/pots,
note: slide switches, be careful, often felt or foam dust/light seals are present, you don’t want to dissolve them. if they work noiselessly with no balance issues, leave em alone.
https://www.homedepot.com/p/WD-40-SPECIALIST-11-oz-Contact-Cleaner-Quick-Drying-Electric-Equipment-C...
spray, twirl the dials a few times, wait a minute, repeat
it is fast drying, but I blow before and after with compressed air.
If one control needs cleaning, it might be time to take the covers off, (perhaps the front panel off if you are handy and have the tools) and do a decent job of cleaning with better access to the switches/pots,
note: slide switches, be careful, often felt or foam dust/light seals are present, you don’t want to dissolve them. if they work noiselessly with no balance issues, leave em alone.