Is it just mine or does anyone else have an issue with the screen on the S25 Ultra and keeping it clean? I have had smartphones for as long as they have existed and I have never had an issue like this. Fingerprint smudges are one thing but lint, dirt, any kind of moisture that dries on it leaves water marks. I find myself constantly having to wipe it down with a lint free cloth made for these screens. It might be the first time that I wear out the cloth before getting rid of this phone. As it is right now I can't wait to trade this in a be rid of it! Maybe it's the antireflective coating or some other treatment but it's terrible. I certainly hope this is not how all screens are going to be going forward.
The antireflective coating on the S25 Ultra's screen is known to wear off with use. That's likely what is causing the "dirty" appearance. A screen protector will definitely help, but will negate the antireflective effect unless you specifically get one that doesn't.
EDIT - Here's the original Samsung screen protector:
