yes, there is .. right here ... btw there's two ways.
remove the knob
spray where the shaft goes into the threaded area.
rotate the shaft repeatedly
Get the pot in a situation where you can see the wires.
Frequently there will be an opening in that area ... spray there
rotate the shaft repeatedly..
More important is that when this starts to occur, this indicates the pot is failing and spray is a short-term solution.
Plan on replacing it.
As easy as replacing it is... Just do it (to coin a phrase).