bad tint?
also if u clean ur windows with any type of window cleanng solution on the tint side it will also cause the discoloring of the tint this is what ive been told at an infiniti dealership i work at when this also happened to my car awhile back
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If it is a good brand UV shouldn't damage it but if you have been cleaning you windows with a normal glass cleaner that will start to turn it puple you need to use either light soap and water or a special cleaner.
I happen to be a tinter and what the problem sounds like is cheap film. The film I install is made by llumar which actually has a thin layer of alluminum almost like foil, except extremely thinner. This keeps it from ever fading or turning purple. A roll of this film costs almost 400 bucks thats why alot of shops use cheap crap.
There are glass cleaners that specifically state on the bottle that they don't contain ammonia. This is the only glass cleaner anyone with tint should be using other than using soap and water.






