sorry if this is in the wrong place!
All window film deteriorates with age and eventually have to be removed. Two of the most common symptoms of dying film are the dreaded "purple film" and the "bubbling film".
Purple film is caused by non-metallic dyes in the film breaking down and changing color. Bubbling film is a sign that the adhesive used to apply the tint to the window is failing. After a single bubble appears, many more will follow.
These are the household items you will need when removing window tint:
Ammonia (undiluted)
Black bin bags
Super-Fine Steel Wool
Razor Blade or Sharp Knife
Glass Cleaner
3 hours of time
Nice hot sunny day
Ok lets get started!
1. Cut the garbage bag in roughly the shape of the window, spray soapy water on the outside, cover it with the black trash bag and smooth the plastic flat.

Most window tint is constructed of multiple layers of film. When left under the hot sun, the garbage bag will absorb heat, helping the film peel off in one piece.
2. Protect all inside surfaces near the rear window with a tarp: speakers, rear light, and upholstered surfaces, then spray the entire window film with undiluted ammonia.
Undiluted ammonia has a strong smell. It is recommended that you hold your breath or wear a face mask.
3. While the ammonia is still wet, trap the ammonia against the window film with another trash bag or plastic wrap. Park the car with the rear window facing the sun for an hour to soften the tint's adhesive
4. Now we can start peeling the window film. Use your fingernail or razor blade lift the window film in a corner of the window, and try to peel the film off in one entire piece. Keep the tint moist with ammonia as you strip.
Use a razor blade to scrape off any tint that did not peel. Be careful not to cut the defroster lines.
5. Remove the any residual adhesive with ammonia and Super-Fine steel wool, wiping with paper towel before it dries.
Remove the exterior trash bag, and clean window thoroughly with glass cleaner.
This is a guide only i dont want to be responsible if you end up with white patches over your interior or even worse, highlights!!
Hope this helps people out!