Cloudy spot on window? ??

What's a news paper? LoL
Jk, it does look and feel like overspray so after trying a razor and paint thinner I'm starting to think it's a window film or abrasion damaged. I even tried on a little spot using a green 3m pad. Just made it worse.
'paint thinner' is not a very strong solvent. Try lacquer thinner. Just be careful with your good paint that you don't want removed.