[morzh]

Arran

I had a negative experience with IPA. It simply started taking off the carbon off of the rheostat. I quickly stopped.
If I had a pot open, I will either use a dry cotton swab or simply blow it from the can, and then add some F5 and work the wiper to distribute it.

This pot has that long twisted extension shaft, which I am not sure that it could be taken out.
And, when I wanted to take the whole thing out, I realized that there were so many wires in each lug, plus there is a tap, and I was simply afraid to damage it, as, I am sure, this one is rare, and that special shaft would make it a bear to replace.

Most times, if the switch needs attention, and the pot does not have to be taken out, I leave it; if it does, then I extract it. In either case, I put my Trollmaster (that hand-pump for lubing pots), filled with F5, to the shaft and push some in. The switch, if open, typically does not need D5: a cotton swab with IPA takes the dirt off.