I've been working on a previously thoroughly cleaned with washing up liquid ceramic hob with an extractor fan (stage 1). Perfect light and dust extraction. The display I have with a lint-free microfibre cloth from Edeka (perfect!) Always deducted in one direction until it was 100% clean and free of fingerprints. Then solved the carrier film a few centimeters and bent over, aligned the film at home button and pressed slowly. Thereby pulled the carrier film backwards, thereby smearing the air from inside to outside.