My MacBook Pro 13-Inch 2015 has a green tint when viewing dark background and watermark visible when viewing white backgrounds.

Doubtful. It is wishful thinking. I did mention that perhaps the mark may be less noticeable after the liquid dries, but "perhaps" and "less" are the operative words here. You can certainly wait and see, but I think you will need to replace the Display Assembly. Is it even worth it for a seven year old laptop?

When cleaning any electronic device you just want to use a lightly dampened cloth.

That is liquid damage from some liquid from the wet wipes seeping beneath the glass. Maybe some of the mark will dissipate slightly once it dries a bit, but most likely the mark will be permanent.