Seeing as you live in Michigan and you mentioned that you leave the car outside, I'm betting that all the salt it sees during the winter, which is probably, what, 4 or 5 months out of the year for you? That certaintly isn't helping you.
There isnt' much you can do about preventing it. The only real thing I can think of is washing your car often during the winter, and getting an under car wash to help get rid of some of the salt build up.
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