just superficial plug/thing it connected into damage. A little charring from the rubber on the metal prongs of the plug that can be wire brushed, I think I can manage that!
If the carbon has impregnated the rubber, simply wire-brushing it isn't going to take care of it. Some electrical solvent (not WD-40) may take care of it in addition to the wire brushing. There is a reason that the lamp sockets are rated for 4,000 volts, and it doesn't take much conductivity for that shit to flash to where you don't want it. If you have access to a meter that will read in meg ohms (millions of ohms), you can get a pretty good idea when it's clean.
Good luck.