Your windows let in lots of beautiful natural light. Unfortunately, they also let in harmful ultraviolet rays and don't provide good insulation. Applying window film can help solve these problems by keeping out ultraviolet rays and providing some insulation, as well as protecting your privacy.
Many films also have a low-E coating that resists the passage of heat.
Mix a cleaning solution using 1 ounce liquid detergent and 12 ounces distilled water. Don't use household window cleaners that contain ammonia or vinegar. They can dissolve the film's adhesive. Generously spray a window with the cleaning solution. Scrape off caked dirt or paint with the razor scraper, and spray the window again.