Using this window privacy film is easy. First, make sure to clean the target window surface thoroughly. Then, measure the surface and cut the film, leaving an extra inch on each side for easy adjustment. Fill a spray bottle with enough water. Spray the window surface with water and peel off the transparent backing film along a short side. Install the film onto the window. As you apply it, use a squeegee to remove excess water and any bubbles, and then wipe off the water with a towel. Finally, trim off the margins. When applying in cold weather, use a hair dryer to blow hot air on the film to soften it up (it can resist heat up to 176°F). Keep in mind that the film only works on flat, clean, and smooth surfaces. To quickly remove the backing film, you can affix a scotch tape on a corner of the back side (the smooth side). For maintenance, just clean it with a mild detergent and a soft cloth when it gets dirty. It's that simple!