Regardless of the type of window film or stickers you purchase, the principle will be the same. We also have several targeted video tutorials which you will find by clicking here.
Removing window film can be a very easy process, but it all depends on how long the film has been on the glass, and the type of film that was used.
Here's a video tutorial which shows the basic principal.
Typically, films are either made using PVC or PET.
PVC is a soft material which can be peeled off the glass with a glass scraper. Any glue residue can be removed with soapy water and a scraper.
PET is a brittle material widely used for solar and safety film, and might be made of layers of mettalised material. To remove this type of film, use a wide glass scraper and lubricate with soapy water to remove the film.
As a rule, old PET film are more difficult to remove than PVC films.
For large panes, it is best to first score the film into strips with a sharp knife. This means that you can tackle it in more manageable pieces.