Good rec., David! Caig labs is the audiophile's choice for contact cleaners.
Be careful, though. Contact cleaner is for contacts, not pots. Contact cleaner has no lubricants in it: it will do a super job on cleaning the pot (including removing all the old lubricant), but the pot will wear out fast! It also has to be safe for plastics as well..READ the label BEFORE you buy and spray!
The proper stuff used to be called TV tuner cleaner, but since mechanical TV tuners no longer exist, I don't know if that stuff still exists, at least under that generic name.