Can I clean iPhone SE LCD with digitizer with Isopropyl or what?

I have fixed my iPhone SE from water damage and it turns on and all that, but the screen doesn't give me nothing. I saw on the back on the screen that their were som "water" marks or something. I actually tested the screen on my 5s to see if it worked and it did. The only thing was that the screen had like some water or other signs in the top of the display. After that a took it of and set it away a few days. Then I tried it a second time. Then it didn't work.

I then thought about cleaning the LCD/Digitizer

I used Isopropyl alcohol to wipe it but still it doesn't work.

My question is if I should have used Isopropyl alcohol to clean the marks of the lcd/digitizer, or done something else? I really don't know! Please help! (picture under)