The film has a same Aufbringprinzip like most other alternative products (mumbi). Somewhat confusingly still works almost always good. The main thing - a 100% dust-free (and fat-free) surface to have and act as quickly as possible before the airborne dust particles get on the sticky side of the film or on the screen. Then it's over. The last time I had it cleaned with "W5 wet general purpose wipes" the display, dried with paper towels and applied the film. That said, it also goes without window cleaner and Mikrofassertücher. Overall 4x films ordered (for iPhone 5 and iPhone 4) - unfortunately, a film was not tacky and had in the trash.