I'm just pointing out that - and I'm not electrically qualified - operator error can result in unanticipated consequences. Last gig I worked out that the red RCA connector was AWOL and I tested MP3 player. I swapped leads. Still no go. The other guitarist was complaining of zaps. I touched his mic and got nothing but I wasn't wearing my guitar. I told him it must have been his shoes picking up static. This time I connected to the input I'd been using for him, and I got multiple zaps - to the point I got mic-shy. So - WD40. It might works short-term or instantaneously give you a result so you think great. And you may not notice the longer term impact of it. Used sparingly as Strat-a-various relates is empirically not harmful- it's not the careful q-tipper, but the gratuitous sprayer slathering it all over everything that's the focus of caution. 'They said it was OK, and a lot must be better than a little'.