Windshield problems of the 2009 Subaru Forester

My problem is with my 2009 Subaru Forester, purchased new. There is some sort of residue that forms on the windshield when we use the defroster (which we use a lot due to montana winters). It cannot be cleaned off. We've used multiple products to attempt to remove it, and not matter what, the result is a greasy film that reflects light into our eyes at night, or uncleaned, obscures our vision. It has to be something in the heating system because this is our second windshield, and both were affected. Initially, the dealership said it was new car outgassing, then they said that "all of them do it". It's become an issue, as we drive 70 highway miles a day to and from work, in all conditions in montana. We also know that it isn't new car outgassing because we've had the car for nearly 2 years and approx 45, 000 miles. We must clean the windshield at least 1 time per week, or we can't see in the sunshine or headlights. Additionally, the residue is worrisome because of potential health issues from breathing it.

The contact owns a 2009 Subaru Forester. The contact stated that while driving approximately 50 mph, snow fell from the top of a heavy truck and cracked the windshield. Small lines soon moved to all sides of the windshield. The vehicle had not been taken to the dealership and the contact had not spoken with the manufacturer to-date. The vehicle had not been repaired at the time of the complaint. The current mileage was approximately 24,000. The failure mileage was approximately 23,000.