[BobAliceInATree]

If you’d rather not lick your finger, you can get one of those old-school sponge stamp/envelope moisteners.

[endoblast]

Or lick the back of your hand and then moisten the finger on that. More discreet and more hygienic (well, hygienic for you at least).

[Izkata]

I'm not as old as everyone else here is mentioning, but started having this issue a few years ago with my phone. My fix was to rub my hands together for a few seconds. Don't know why but it's always worked for me.

[mh-]

I'm curious if you have issues with pulse oximeters too. The thing they use to check your blood oxygen level when you go to the doctor.

I don't tend to have the issues everyone here is talking about, but those things never work for me on the first try.

[TylerE]

Those work off light absorption, so different mechanism.

[mh-]

Understood, but idly wondered if there's a correlation between people with one issue and the other.

[Izkata]

I don't remember, it's been a long time since I've seen one.