Our film is scratch resistant but it still can be scratched or cut. If there is a little piece of debris stuck between the film and the sweep (bottom of window top of door panel) the film can get scratched, gouged or even cut. Basically, any hard foreign object can scratch the film.
As far as cleaning is concerned, you want to stay away from ammonia based window cleaner. Now a days it will say right on the front of the cleaner AMMONIA FREE, so you don't have to go searching the ingredients. The tint is installed on the inside so you can use an ammonia cleaner on the outside.