Ive cleaned my Audi today, nothing out the ordinary there... but to get rid of the smear marks on the outside of the windscreen I used some Meguiars Glass Cleaner. Which worked, but has left strange arched marks on the windscreen (where the wipers would finish if you were to put them on.) hope this makes sense. Any ideas how to get rid of these please? ive redone the windscreen with the glass cleaner but they are still there, and even done a very small area with turps but the marks are still there.