All safety glass used in American cars is laminated (including those made and sold in Canada) and will delaminate, hence the white haze you see around the edges of some windows. Use any dish detergent (dawn, etc) in water and use a new sharpe razor blade. Wet the window with the soap solution and with the blade lying almost parallel to the glass, scrape it gently. Won't hurt the glass unless you get too much angle on the blade and it chatters then it MAY leave a mark. Do a small area at a time and wipe it dry to see your progress.
Larry