Question: how does wd 40 work?
Answer: WD-40 isn't actually a true lubricant. WD stands for "water displacing" and its main use is as a solvent or rust dissolver. The lubricant-like properties of WD-40 come not from the substance itself, but from dissolving components. ... WD-40 can be a good substance to start with — it can help clean up rust or other grime.