Corroding clear coat, what from?

There is a cream color chemical affect going on around all four wheels, this being the worst. Its the clear coat peeling, corroding, and the wheels looking less than lovely.
It snows here, we get de-icer pretty good but considering I've driven through two winters without an issue. I'm suspecting the dealer put something on that corroded it.
Ideas?
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I took the car back this morning, they are going to get back with me. I've made it clear that the circumstances this happened in warrant them to find a solution considering I've never had issues. If they are willing to work with me that will be great, if not - I'll file small claims.
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