Google "wd 40 contact cleaner" and you will find a lot of reasons NOT to use it. I'm not saying they are all valid but if even one of them is it shouldn't be used. I say get some good contact cleaner, why take the chance?
Among the reasons I found:
WD-40 will conduct electricity
WD40 is nothing but a degreaser, does not remove grime and such
WD-40 is a bad idea on contacts that might spark. The residue is flammable
WD-40 leaves a sticky residue that can attract dust.
Initially, you will find the crackly noise vanishes, but the oil then attracts dust, and starts to thicken up. You can't clean it out, it also sprays everywhere making the inside of the device a real mess.
WD 40 will attack some plastics
.
Among the reasons I found:
WD-40 will conduct electricity
WD40 is nothing but a degreaser, does not remove grime and such
WD-40 is a bad idea on contacts that might spark. The residue is flammable
WD-40 leaves a sticky residue that can attract dust.
Initially, you will find the crackly noise vanishes, but the oil then attracts dust, and starts to thicken up. You can't clean it out, it also sprays everywhere making the inside of the device a real mess.
WD 40 will attack some plastics
.