Soak a clean cloth in lacquer thinner so that it is dripping wet.
Hold the cloth over the lacquer stain for 5 minutes. This will give the thinner time to soften the lacquer.
Remove the cloth and scrub the glass with it until the lacquer is gone.
Scrape the razor blade over the lacquer stain if you can still see it. Ensure that the glass is covered in lacquer thinner the entire time. This will help lubricate the area to avoid scratches. Continue until the stain is gone.
Spray the window with glass cleaner and wipe it dry.