Modern smartphones feature an oleophobic (oil-repellent) coating that protects the screen, improves smoothness, and reduces fingerprints.
However, oleophobic coatings can degrade or wear off quickly, and you will notice a patch of the screen tends to get greasy or dirty with fingerprints more easily. Also, many screen protectors do not feature an oleophobic coating, making them get grubby with fingerprints and grease.
There is a simple solution to restore your oleophobic coating, or to add an oleophobic coating (e.g. iGlaco) to your screen or screen protector, to prevent fingerprints on your touchscreen. You can use an oleophobic coating kit.
Remarks : Apply 2-3 COATS on different days to fully maximize oleophobic coating performance and film durability! Leftover residue on the touch screen after coating can be wiped off easily after 4-8 hrs by using tissue paper. Please do not remove them before completion of film bonding.