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I almost did a head on collision when a work van I shared with a smoking friend (1980) blinded me; the light spectrum spread over the glass completely.
But that was a dirty van; really, really dirty. The McDonalds' wrappers on the passenger side represented an archeological dig.
Came in for free one weekend with help just to clean it out.
Could be a heater core, but probably is just normal outgassing of plastic interior parts. I like the Invisible Glass pre-moistened towels, but as good a job can be done with a good glass cleaner and good paper towels, as Grandpa noted, the cheap ones won't work for this job.
Usually with a leaking heater core you will see some antifreeze drops on the heater outlet in the foot well, and/or smell that maple syrup like smell of the hot coolant.
When I got back home I tried to clean the whole windshield with Windex, but since by that time, the sun wasn't blasting through the windshield, I don't know if it's truly cleaned off.
Use a decent powered flashlight and at the right angle... it should show.
Ammonia (clear non sudsy) is one of the best glass cleaners made. Why do you say not to use it?
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