Everybody knows WD-40 is the go-to product for silencing squeaks, displacing moisture, preventing rust, and loosening stuck parts. You probably have a can sitting in your garage right now. It has a ton of uses, but it's no panacea. In fact, there are a some jobs that the lube will absolutely ruin.
Yeah, OK, it's a water dispersant not a lubricant. And sure, true enough, you probably don't want to put WD-40 anywhere near your lovemaking parts. But besides all that, I see what you did there, Spanish-language ad agency. [Reddit]
You probably have a can of it somewhere. Save the time searching, pick up one of their limited edition twin packs, and finally fix that squeaky door that's driving everyone crazy.