How can I clean fallout from my car's windshied?

Thanks for suggesting the detailing guys, but I have already been there. The glass is crystal clear during the day, making it hard to show the true issue when I arrive at the auto service centers. The detailing owner told me he has the same problem and it's just an enviromental factor and said vinegar would cut through it. While on a road trip with my sister and her husband we drove into heavy rain. I couldn't see through the windshield so I stopped at a convenient store to buy vinegar. I poured it on straight from the quart size bottle and saw no difference.

I bought the Subaru from a dealer a few years ago. It had almost four thousand miles on the odometer while being used as a demo.

For many years, my rural area has dealt with fallout from whiskey distilleries and the EPA that protects them. As much as I would like to blame them, I can't, as the windshield was greasy when I bought it at a dealer that had used it as a demo. Their service center told me the issue was the result of wax and spot-free rinses applied at drive thru car washes.

Buy a new windshield and see what happens. They aren't that expensive. I had to replace my windshield on a 2 year old car because it got smashed in my some hoodlums. I did NOT use one of the nationally recognized windshield replacement services as they wanted me to wait 2 weeks and were about $200 more for a factory windshield. I used a local company who came out the next day. He came out to check my mess same day, cleaned it out and prepped it and called in the order for my new windshield. The guy was absolutely fantastic and did more than I expected.