[{HVY-E}Jinxx]

You'll need the following items:

Electrical Contact cleaner.
Electrical lube.
Cotton cloth (Cloth baby diapers work best).
A Pencil Eraser.

Go down to an electronics store. A real one, not Radio Crap.
Get some electrical contact cleaner and some electrical silicon lube. It will look like a very thin red grease. (Vaseline will also work in a pinch, but will require maintenance more often).

Once you open up the pots, spray them with the cleaner and gently clean the ferrite contacts with a soft cotton cloth. Do not use cotton balls or q-tips if you can avoid it.
Using your eraser, gently clean off the metal contacts of the Pot where it rides on the ferrite, then spray it with electrical cleaner.

Once everything is clean, spray the inside of the Pot with lube. It doesn't have to be very much, just enough to relieve any friction.

Now just put it all back together.

While different Sticks have different Pots, they are all basically the same. Techniques for disassembly is what will be different.
Depending on what kind are in your stick, you may be able to find a suitable replacement at Fry's or some other electronics store.

S!