Place a towel on the floor or area under the window to catch shavings. Mix 2 tablespoons of soap with a gallon of water, and agitate it until it is full of suds.
Wet the window or spray it with commercial window cleaner. Cover all of paint with the liquid. Use a sponge or rag to further wet and lubricate the window with the soap mixture. This will help keep the blade sliding along the window without scratching the glass.
Score the edges of the window with a utility knife to separate the paint from the window sill or edges.
Scrape the paint off the window with a glass scraper, holding the scraper at a 30- to 45-degree angle to the glass. Clean the edge of the scraper after each strip of paint. If the window gets dry, reapply the soap mixture.
Clean the windows with commercial window cleaner after removing all the paint, and dry with a clean towel.