If it was me I would bot use WD40 unless it’s a last resort. WD40 is a solvent but leaves a residue behind that is in general just messy. Electrical contact cleaner can be had at most auto parts stores and should be used. I would also suggest that once you clean the socket and it functions as needed use a little dielectric grease to keep things free of corrosion and working properly.
I never looked at WD40 as a solvent
Of course since the automakers have been using the same style bulb for like what? FOR EVER!! In the 'old days' people used stuff like lacquer thinner and Vaseline