Which method woks best on hurricane impact windows?

Whether you have a lot of paint or a little, you can use a scraper to loosen the paint from the glass. Use one that takes a single-edge razor blade, which can be bought for a few dollars at a general or hardware store. Remember to keep the blade as flat as possible against the glass. Take special care when scraping around the edge of the window where the frame is -- you don't want to cut the frame or the caulk that goes between the pane of glass and the frame. When you have loosened all the paint, you can remove the loose bits by wiping with a dry cloth. Then clean all the window panes with a little glass cleaner such as Windex and finish off with a dry lint-free cloth.