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Does your windshield have a plastic coating on the inside surface? I had a vehicle that had this, and it stayed hazy forever. If yours definitely does not have a coating,
you could try some solvents on the glass to see if any could cut whatever is on it.
You might try vinegar on it in the event it was caused by condensation. The moisture
can mix with any dirt on the glass and fix it to the glass. Or pay a good detailer to
clean it.
A household product called Bon Ami has worked well with a wet sponge. You could try a HIGH quality glass cleaner from stoner. Use crumpled up newspaper to clean it. The crisp edges of the newspaper does a great job. The printing does not hurt the glass just your hand. Dont use paper towels. They have a wetting agent in them that leaves it looking hazy.