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Do not spray WD-40 on your car. "Water-Displacement, 40th formula" was originally developed to prevent moisture from forming (and freezing) on the skin of Atlas missiles and worked rather well for that. But it also contains various hydrocarbons as part of the formula, several of which are unfriendly to some paints and plastics in addition to being a very poor lubricant, and there are many more effective lubricants and protectants, if that's even indicated in this case.
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