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See the pic, this thing has been in rain and washed 100s if not 1000s of times, I've never seen this before! It looks like the water somehow got between the glass and the reflective backing, so strange. So just letting it dry out might be fine but, does it need resealed in some way and if so, how to get it out to do that? Does the whole assembly have to come off, will that require door panel etc removal?
Also look in the upper right, there's what looks like a burnt area, or could maybe be rust. Water got behind the glass of the mirror, plus a burnt or rusty spot top right??