Repaired Broken Screen, Left Mark on LCD

So it took half my life, but I finally got the smashed glass off my iPad Mini 2 and have the unit open. The LCD was pristine, but a small chunk of glass left a crescent shaped white mark near the middle of the LCD screen. I'm afraid to try to clean it or wipe it, but I want to make sure that if I go through with the rest of the repair, I won't have to pull it apart again to replace the LCD as well.

Any ideas?

On a related note, anyone want to buy a slightly open iPad? ;)