I've got a 2001 X5 that is black. And since we have had the car (about a year) we've had this rainbow look on the outside of the door only around the windows and going to the outside edge of the door. It looks like it's ono the window rubber too.

Any idea what this is and how to get it off? I've tried just using mild auto soap and water and and scrubbing on it with a sponge.

A Clay bar maybe?