Unfortunately, they also let in harmful ultraviolet rays and don't provide good insulation. You can apply window film to keep out ultraviolet rays, add more privacy, and help insulate your home. It is specially coated to handle problems around the house. A variety of films are available, including dark film for privacy, reflective film to keep your house cool in the summer, bronze film for soft lighting, and frosted film for a translucent look.
Many films also have a low E coating that resists the passage of heat.
Mix a cleaning solution using one ounce of liquid detergent and 12 ounces of distilled water. Generously spray a window with the cleaning solution. Don't use household window cleaners that contain ammonia or vinegar. They can dissolve the film's adhesive. Scrape off caked dirt or paint with the razor scraper, and spray the window again.