I own a window cleaning company and get overspray and paint off glass all the time. You don't need any solvents or thinners to worry about your paint. Just squirt some Dawn or Joy into your water, make it fairly sudsy, and put it on your glass. You can use 0000 steel wool, 000 can scratch or a sharp razor blade, either one works. The soapy water keeps the glass from scratching, it works on trucks or houses, just don't scrape any glass dry you will scratch the glass.
Squeegebob
