Thank you. Well, I've asked Perplexity (I know, AI can be wrong), here is what it answered to my question "Can the Samsung S24/S25 Ultra anti-reflective coating wear off an leave permanent smudge?":
"The anti-reflective (AR) coating on the Samsung Galaxy S24 Ultra and S25 Ultra can wear off over time with regular use, and this wear can lead to what appear as permanent smudges or oily marks on the screen. Users have reported that the oleophobic coating, which helps repel oils and fingerprints, tends to degrade within several months to under a year of use. This degradation can create visible smudges that do not clean off easily and can make the screen look dirty or scratched, even though the glass beneath may remain physically undamaged.
This issue has been noted by many owners of the S24 Ultra, with similar experiences reported on the S25 Ultra. Some users see wear as early as a few months into usage, and in certain cases, the affected areas reflect light differently, making the smudges even more noticeable. The coating's wear does not necessarily mean scratches on the glass itself, but it does impact the screen appearance and touch experience negatively.
Samsung Gorilla Armor glass used in these models includes the anti-reflective element as part of the glass's properties, but the oleophobic coating on top is a thin layer that is susceptible to wear from normal usage as well as from certain cleaning materials. Samsung and some retailers have suggested using screen protectors to preserve or replace the coating's effectiveness.
In summary, yes, the AR and oleophobic coatings on the Samsung S24/S25 Ultra can wear off, and this can leave behind what look like permanent smudges on the screen. These marks are due to the coating's deterioration rather than permanent damage to the glass itself. Using screen protectors or careful cleaning can help mitigate or delay this issue but does not completely prevent it in some cases."
