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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.
Many arthritis patients find that over-the-counter (OTC) drugs provide them with pain relief. Ointments like Aspercreme and Vics VapoRub are thought to work because they create new sensations that battle it out with the pain sensations, vying for spinal cord and brain precedence.