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I believe Covercraft says this is caused by pollution/ general poor air quality. This was my second biggest pet peeve at the time with just one Weathershield cover. I'd get those awful marks near where the seams were. So I went and did the 2 cover method : Weathershiled over a Noah. In addtion to enhanced protection from rain, I virtually eliminated that hazing, to a point that if any is present, QD can remove it. Whereas before, it sometimes needed a wash, it was so bad.
JDookie has the latest and greatest car cover fabirc: Weathershield HD. It sounds to me that it can put an end to needing the two covers ( WS HD wasn't around at the time I got mine).
Maybe he'll chime in with a report about any smearing.
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