OK I tried t-cut metal polish and it worked great... screen looks like new. The trick is to apply a little pressure while rubbing the screen, then buffing out with a dry cloth, then windex to remove all residue. Very happy with the results.

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2006 BMW X5 4.8is (current)
2006 BMW Z4 3.0si (current)
1992 BMW E30 325i cabrio M-tech (RIP)