Yeah, I understand where you're coming from, a lot of techs talk down WD40...but IMO it is one of the best products out there period. In the 40+ years I've been using it, it's done a lot more good than harm.
It's saved my lollipop countless times. YMMV.
I use it for everything from cleaning strings to scratchy pots to crappy JTV bridges, personally I had better results on one particular bridge than from using De-Oxit and other electronic cleaning products I've had lying around.
The Dead A string came back to life after a tiny shot of WD, and I've been using the JTV regularly since. I avg. 3 gigs per week.
Whereas, L6 tech support has let me down too many times with non-answers and just general lack of knowledge. the condescending tone doesn't help either. I wouldn't count on them for the telling me the correct time.
With respect to failing piezos and the grounding issues on JTV's, and other bridges issues.
I'm calling out for anyone to sound off with legit, workable solutions. I'm far from a Mr. Know it all, but I know what has worked for me.