Maintaining Fridge Gasket
You do know what a gasket is, right? That rubber piece that makes a sucking sound when you close the door of your fridge. This piece separate the fridge door from the fridge frame, and it also collects some of the nastiest gunk on Earth. By attaching the thin WD-40 nozzle onto the can, you can spray into those small difficult spots and then just wipe away.
Exterminating Bugs
Cockroaches can survive a nuclear blast, but can they survive a severe spraying of WD-40? That is a question you might have to answer yourself. We can tell you though, that other bugs have found themselves a new enemy.