Allyson Kazmucha for iMore on the WD-40 home button “fix”:
>WD-40 may be non-conductive but the solvent in it will break down plastic. Your home button is plastic as well as some of the internal parts. Your speaker assembly is plastic and sits directly below your home button.
[Exactly](http://brooksreview.net/2012/01/wd-40-trick/).