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I have the OEM Car cover as well for my 535 and have had them on my last 2 BMWs. All Jet Black too. I have never had an issue with scratches or swirls. I also get smudging and trapped dust / dirt etc.. but no issue coming right off with a wash. The cover can be left on during the rain as the fabric can "breath" and will dry out very quickly. Give it a wash and see what happens. When putting it on i always put it on the front windshield first and roll it out to the front and back.
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