Heh before I got my 09 camry SE, i had a 91 poniac and some paint ended up on the windshield. Take Dot 3 brake fluid...poor it on your windshield and use a cloth to spread it over where the paint is...let it sit for a night in the garage shed...in the morning use a different cloth (since the first one already has fluid on it) and use the dry cloth to remove the paint.
Btw, JimD is right, if its a light layer of paint/fresh paint...mineral spirits should be able to remove it since it is a thinner...but when i did that..my paint had been on the windhsoeld for over a week...so i juse did the dot 3 thing and worked like a charm