2011 535 with the same issue. Only visible when the sun is low on the horizon. OCD so I can't deal when it happens. Used a clay bar on the paint and all windows about 6 months ago. You could "feel" the contaminants coming off the glass but didn't help with the micro chips in the windshield. Want to replace it but I know the minute I do I'll get rocked on the interstate. Waiting for post rock cracked windshield to replace. Virginia Beach, its only a matter of time.
Let me know if you find a solution though.
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