[Texasrocker]

Ive been restoring vol & tone controls for many,many yrs with WD-40.Never ever had any probs from using it.Personally I have found after dis-assembly of controls,( when required), that if any pot has internal intermittent probs after using WD 40, those probs were existing prior to using it. It didnt matter. Ive flushed out the WD-40 after use and still, a bad pot is bad. The prob will be most likely found on orig fractured carbon-trace, or wiper, or both worn-out from age & use. In some cases, these can be repaired internally with rear-window defogger paint sometimes, or carefully taking 2 pots and assembling 1 good with a dremmel tool. Badly rusted controls can sometimes be saved by "injecting" WD 40 with a small-tip medical syringe, where spray can tubes wont fit, even the WD-40 can spray tube itself. Other times, full replacement of controls are needed. Heres the scoop on WD-40 from the website as noted by inventor (chemist) back in 1953 according to his orig lab book.
http://www.wd40.com/faqs/#q1