It leaves dirty oily fingerprints on the screen. Disgusting. So triggered. How do I make them stop?
Put a sticker on the screen titled “each touch earns a slap”; slap their face as hard as you can when they touch. — They cannot sue you since there is a warning sign. — Problem solved; you’re welcome.
Demo them that you can use those fingerprints to construct a device that will allow you to impersonate them (to unlock their phone, for example). I’m not positive about the existence of such a thing now, but otherwise you can tell them you’re working on that as a side project. Use your obsession at your advantage. Update: This approach may better be pursued if the simpler ones above don’t work.
I used to start cleaning the monitor with a moist wipe right after they had touched and in front of them. I never said anything and did that with a smile. That was enough to give them a message.
I actually really like this, it's polite and passive aggressive.
Tell the you have OCD and that it drives you crazier.
Every time someone touches your screen, ask someone to beat the shit out of you on the way home. Keep a pair of brass knuckles on you to help them out. Keep doing this every time someone touches your screen. Eventually, your co-workers will notice the connection and stop touching your screen.
Don't let them know it bothers you because now they will do it more.
If that’s the kind of coworkers you have, consider changing employment.
Keep a wooden ruler on the desk and slap their hands down
This
I actually have a friend who will grab your hand when you Point at him....he doesn’t like being pointed at
Reminder - Steve Jobs ridiculed the stylus and created iPhone to be used with the "most natural pointer", the finger. Hope this helps you find creative workarounds to your problem.
Stinging nettles
Like when they are pointing to things? "Would you mind not touching the screen" should work
But then you have to say that to each person who does it - not very efficient