What is this on the glass??

I haven't tried clay but I can't see this working since it's been stubborn even to razor scrapping.

I was baffled by the ceriglass not touching it. I even tried the grinder instead to be more aggressive but it really didn't work well because my grinder doesn't control speed and it would splash ceriglass all over in a couple of seconds.

The windshield was totally covered by this so any solution would need to be relatively easy since I was not willing to spend 5 hours on it, replacing was definitely the best way to go. Wife is really happy with 4K view out front now!

I have an older pickup truck with very scratched glass on the driver window. I will try ceriglass there and see if it helps. I was meaning to do that for years already. Good opportunity now.
 
Take the edge of your razor blade and run it on a file or sharpening stone to round it a little. That way it won’t bite into the glass if you push too hard. WD-40 makes a good blade lube and just might help get that stuff off the glass. It cleans of easily with apc afterwards. Maybe acetone if all else fails.
 
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