system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are laptop screens so hard to clean compared to smartphone screens? They seem to use some sort of coating that leaves nearly impossible to clean stains where as on a phone they just wipe off, why is that?
gpt
Touchscreens usually have an oleophobic coating on the surface. 

Phone screens are designed specifically for touch input interaction. Smartphones and laptops with touchscreens have an oleophobic coating on the glass which repels oils and allows for easier cleaning. This oleophobic coating can, of course, wear off over time, meaning finger oils will become progressively more difficult to keep off the screen as the phone ages. I've also seen some devices where the oleophobic coating wasn't applied evenly, and you could tell where finger oils stuck more visibly around the edges of the screen.