[Arran]

Hey guys, I am back to the project, finally.

Need to clean the whole thing.
I started with cleaning the tuning cap.
It is a three-section one.

Really filthy.
What is a good way to clean it? So not to damage insulation, give it some shine, and (I think it is needed) to lube the rubbing places?

I would not take the rotor out of the tuning cap except as a last resort regardless of what anyone suggests, you may get it apart but you will have all kinds of troble getting the rotor and stator lined up again. You can remover the entire tuning capacitor and wash it, I like to use TSP and hot water but strong soap will do it, then rinse it out, then let it dry with the plates open, then regrease or oil the bearings.
Regards
Arran