Cloudy Windows, Ugh

[secondcurve]

I made a stupid mistake recently! After hauling the boat out of the water for the winter I threw the plastic windshield from the bimini top in my trunk and forgot about it for a couple of days. The experienced boaters on the forum know this is a major no, no. Well you guessed it, when I got around to putting the windshield away for the winter I noticed that where the sides of the window had been pressed together a cloud had formed on both sides. Nothing terrible, but I am sure it will annoy me to no end next summer. My questions. What causes clouds such as these? Is it possible to remove them? And finally, if they can't be fixed, which I am pretty sure is what I am about to be told, how much would it cost (roughly) to have new plastic put in a windshiled that is about 3 1/2 feet by 2 feet, give or take? Thanks!