If you are not absolutely sure that your contact enhancer will not rub off and bake into and onto your tube socket, then don't use it. Instead, as suggested, do a very light sanding or buffing of the oxidation.
cleaning the pins of NOS tubes...bad idea?
I am a tube noob. Just bought my first set of NOS tubes. I use Kontak, Deoxit, ProGold and the like on the connectors on my cables. I notice that the pins of most NOS tubes show significant oxidation. So...is it a good idea to use Kontak or the like on them, or do you just leave them alone?