Try a credit card, or ice scraper, awhile back, Oldsmobile used a "
safety " coating on the inside of windshield, what a mess come sticker
time ! The auto industry responded with a plastic razor blade, check
with an auto body supplier to see if still available. Bronze wool
[ boat supply ] is used to clean fiberglass boats, works great on glass.
I'd avoid solvent, as it tends to turn paint spots into paint film.
I don't know what type paint, or how much landed on car, my guess is
it's house paint, and should come off easily.