WD is in fact perfect stuff. Cheap, fast and simple! It displaces moisture, it wicks/creeps and the very thin residue gradually dissipates. I got on to this stuff many years ago when having to deal with rain-soaked rifles and shotguns in cramped and unheated circumstances. Stripping a gun down to dry off and then oil the parts before overnight storage (that's when the 'wet ones' really rust) is a PITA! But zapping the entire 'firestick' (including wood and internals) with an aerosol can of WD gets you through the rest of the day and overnight (at the very least) without any problems.
Works great to dry a wet ignition system also. Plug wires, distributor cap ect.