Well it depends on how long its been exposed to the elements, if its baked in you have no choice but to use a machine and a glass cleaning compound to remove the watermarks.1. Water streaks
You have two choices either use a polish and machine to level the swirls or fill the swirls with glaze and wax.2. Swirl marks
Try using 3M scratch remover, remember this is only for spot threatment.3. Light scratches


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