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Measure the dimensions of the window's glass (inches or cm)

1. Measure the window's glass, cut the film with a knife (cutter) you have to leave 2 mm (1/16") betwin the film and the frame of the window.
2. Clean the glass with an appropriate product (if necessary go over with a razor-blade)
3. Steam generously with water (ambient temperature) mixed with few drops of liquid soap.
4. Detached the film and adjust the above part at first, while keeping the window clean from dust.
5. Using a squeegee push the water out from behind the film, by pressing from the middle to the extremities.