Is it the glass or the plastic between the glass that's hazy? Other than etching or similar process I've never heard of glass becoming hazy. If it IS the glass you might try using jewler's rouge with a soft terry cloth over a random orbital sander pad & try buffing the haze out of it. Glass is hard so it might take some effort to get it right. If it's just a coating of some kind that windex won't touch use Bon Ami oven cleaner to clean the glass. It'll put windex to shame on any glass window.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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