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A popular myth has grown around the use of WD-40 as a joint lubricant and pain reliever for arthritis. The liquid is sprayed on the painful joint much as one would fix a squeaky mechanical hinge.
Today, WD-40 is a household name and is commonly used for all sorts of home and commercial applications. Chances are you grew up seeing a can of WD-40 around your home or garage, and you may have used it yourself to lubricate hinges or to loosen sticky residue around your home or for a myriad of other uses.