Banana ? stained my screen
[When I try to clean it with water ](https://m.imgur.com/6KxUnG2)
Yesterday I was having a banana ? and while peeling it I notice that my thumb got smeared of sap a bit. I went without washing an play Pubg for a while and today I notice that exactly in the place where I used to aim and shoot there I a stain..
My first thought was that I could be the banana from yesterday but I’m no entirely sure.
The problem is the stain does not come out. It look like kind of remove the oleophobic coating in that part of the screen. [Look at this pic](https://m.imgur.com/6KxUnG2) while I rub it with a drop ?of water.
I also try a bit of soap, with lo luck..
What do you think happen ? Do I have any hope of removing that without further damaging the oleophobic coat?
Thanks in advance