what is not dirty? you tell me.
handles in mrt train, buses etc, door knobs, dollar notes, coins etc etc etc.
you are touching everyday......
Not as dirty as the TV remote control.
"You will not be remembered for the gear you used, but by the photographs you created"
Every where you go are dirty la. Just that no one's bother. As long your hygienic is good, you should be fine.
Only Sony device mostly, haha!
Some years back it was the PC keyboard, why would a touch screen be any different. At least it's easier to clean.
Those people protecting their devices with pass codes should wipe their device more often. The smudges from the fingers reveal the code / gestures nicely.