Quality film professionally applied and well cared for should last from 3-5 years or even more. With poor care e.g. if bird dropping’s are left on the paint for an extended period of time or not washning the car at least once in every couple of weeks, you might have your vinyl worn befor 3 years time.
Keeping the vinyl clean will help reaching the 5 year out of it, while still looking good. We are not huge fans of the pressure washer for cleaning the wrapped car, although it is acceptable to use it but with the nozzle never pointing to the edges and overlaps, and with the pressure bellow 80bar.
For washing, you can use plain water and detergent as for any other painted car, there is couple of dedicated products for the maintenance of wraps.