Hi Has anyone noticed the streaks/ grime on ur M5( or 540) windshield--you clean the glass, looked great but especially at night when raining you can streaks and blobs like some kind of relaese compund- makes it difficult to see. My 540i had this after i replaced windshield with orig bmw part--had to use bon ami to get it off
Anyone here have other suggestions to clean this "release coat" off??