How do you remove old window film?

First, gather the necessary tools. You’ll need:
An ammonia-based cleaner, one cap full of dish soap
A professional grade razor scraper and lots of extra blades
Lint-free towels
Optional: Steel wool, a mop, and a steamer
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Start by scoring the window film with your razor, dividing the film into manageable sections. This will also allow the ammonia to work its way under the film.
Generously soak the window with an ammonia based cleaner with a cap full of soap. This will break down the film’s adhesive, so the more the better. Let it set in for a few moments.
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Look for a corner or edge of the window tint that has already begun to lift and start there, or use your razor to get a corner started. With your fingers or a pair of pliers, gently peel the film away from the glass. Use your scraper to separate any patches of stubborn adhesive as you peel off section by section, being careful not to rip the film. To keep from scratching your windows, replace the blade in your scraper frequently. Make sure that you wear gloves to protect your hands when working with the blades.

Once you’ve removed all the window film a good amount of adhesive will most likely be left on the windows. Apply more cleaner and use a fresh blade or fine steel wool to remove the remaining glue.
Finally, cover the window one more time with your cleaner and use a lint-free towel to wipe the glass clean.
Now your windows are ready for new  window film.
Heat will help to disintegrate the adhesive as well. So, if you have trouble peeling the film, try mopping a mixture of hot water and ammonia onto the windows, or using a steamer.
I hope this was helpful. Feel free to leave any questions or comments below 😎