Used it for my oculus controller and fixed my stick drift.

Used to clean model train track from black buildup / residue that inhibits electrical conductivity, which would keep the trains from running. The black residue is layer upon layer of microscopic deposits of oxidized metal caused by micro-sparks created as the power pickup wheels roll on the metal track transmitting electricity to those wheels. WD40 Contact Cleaner was recently listed as the second best at removing the black residue plaguing every model railroad. Number one is highly flammable kerosene and the effectiveness between them was about 1% difference. I spray the WD40 Contact Cleaner on a rag, start at the middle of the track piece and wipe to the end, then back to the middle and wipe to the other end. I found starting at the end caused the rag to catch on the sharp track edges. Use outside or in a WELL ventilated area. Be prepared to see thick layers of black come off the first several cleanings and diminish to slightly gray as the track gets cleaner and cleaner. WD40 Contact Cleaner evaporates quickly and leaves none of its own residue behind. You will need to clean the power pickup wheels and axle wipers on the trains as well.

Finances are very tight for us so we try to maintain and salvage our equiptment as best we can. The WD-40 electric parts cleaner has proven to be an excellent product in our experience. We've used it on our guitar potentiometers, an old clock that we inherited among so many other tools and products.