Colin might not be helpful as the chemical or salt that the water contained has sort of solidified on the windshield. Do you have other glass cleaners? There's one available from vista which is pretty good. Spray liberally on the effected area and wait for a while. Then rub with a soft cloth.
This typically happens when glass is exposed to hard water for quite sometime and allowed to dry.
Actually cleaning a car regularly with soft water will remove some of the hard water salts.
If this does not seem to work, please visit Windshield experts.
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