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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.
This isn't so much an answer as a question. Have you used the soldering iron or is it brand new. If it's new, return it. If it has been used, spray some WD-40 around the tip where it goes into the iron and let it sit for a day. You might have to do this several times, but it should loosen the tip eventually.