Use Steps: Step 01. Keep Window or Glass clean Step 02. Wet the Window or Glass with water(Soapy water will be the best choice) Step 03. Remove from backing protect sheet(which is a kind of clear vinyl, please MAKE SURE remove it before you apply the window film to glass) Step 04. Apply to wet glass and smooth with hands Step 05. Squeegee away water and air bubbles. Key Notice For Frosted Window Film: 1. If you want to remove it, simply peel the window film from any corner. It comes off cleanly without leaving residue 2. When not in use, the film must be replaced and stored on the original backing paper. The side of the film that touched the glass should face the glossy side of the backing paper 3. Our film does not apply to carved, over frosted or irregular glass