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Wd 40

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WD-40 is cheap and it works, especially if you are planning on removing 25-year-old bolts. I sprayed the stuff on every nut and bolt on the suspension. When I was a young dumb kid my dad told me again and again to spray every bolt on whatever I was working on. Nowadays I spray the suspension with two or three coats of the stuff for days prior to wrenching.