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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.
1 Make sure you have plenty of rags as you always use them. 2  Warm water always cleans better than cold. 3  WD40 helps keep metal clean and shiny and also prevents corrosion. 4  Get some gloves from your local garage to help keep your hands clean.  Use a chamois to finish drying. This prevents water spots.