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Remove the leads from the pot. (you can keep the terminal heated and the solder molten and coax the wire out with needle nose pliers...unless a terminal is especially delicate I don't bother removing the old solder) Remove the pot from the chassis. the front will be phenolic with the metal shaft collar and a metal plate covering most of the phenolic. The back cap of the pot will have ~4 fingers that fold over the front metal plate to hold the pot together, pry up those fingers (a very fine flathead screwdriver or dental pick is god for this) and it should all pull apart. Clean the inside thouroughly with an old discarded tooth brush and some control cleaner, then come back with paper towel and or Q tips and more control cleaner. Once it looks spotless reassemble in reverse order.
If there has been a lot of arcing and it has carbonized the phenolic, try and scratch it off.
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