Step 5 : Remove the clear backing liner from the film
Usually the liner is on the outside surface of the film roll. Remove the liner by attaching two pieces of transparent tape to the front and back surfaces of a corner of the film so that about 1-inch of tape is on the film, the rest centered and hanging over the pointed corner of the film. Press the two pieces of tape firmly together, then quickly pull them apart to begin separating the clear liner away from the adhesive side of the film.
As you carefully peel the liner away, generously spray the soapy solution onto the exposed adhesive. This spray helps break any static cling, reduces contamination, and makes the liner separation easier.
For small windows remove the liner diagonally, from one corner toward the opposing corner. Try to keep the film from touching itself.
For large windows and patio doors it takes two people. Your helper faces the window and holds the film perpendicular to the floor. You face the liner side of the film, separate the corner of the liner, slide your finger along the top edge of the film to fully separate the liner, then peel the liner down toward the floor in a smooth, even motion. After removing the liner completely, thoroughly spray the glass, then the adhesive side of the film.