Residue on my windows?
So I bought this black 03 ford taurus last month for $2500 and there are a few things wrong with it that I'm going to fix. One thing that is bothering me though is a residue on the outside of my windows. I don't know what this residue is but I've tried "Invisible Glass" with a paper towel, and it didn't to much if anything to remove this residue. I was buffing the car and I used the solution for that and my buffing wheel - it started to turn my wheel BLACK... it seemed like it was getting some of the residue off but there is still some residue on it. Anyone know what it could be and/or how to get it off? I tried to take a picture of it but you can't see it in the picture.