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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.
WD-40 has many household and automotive applications. One of the ways to use WD-40 is to use it to clean tar or bugs from a car's bumper, or adhesive and other residues from a floor or other household surface. WD-40 is very easy to clean once you have sprayed it on to a surface.