If you used Windex, or any solution with Ammonia, you should get that out of there... If it is a small drop, it will take care of itself. But do you really know how much is there, and how much has run to another internal area you cannot see.
It is never a good idea to use a cleaner with Ammonia on a laptop.
There is no easy way to get it out.
The Acer Screen is held together by screws which are covered by rubberized screw covers... and depending on the laptop, there can be as many as 10 to 16 screws. It is very easy to damage those screw covers so that they are ugly ugly when glued back on.
If you have never had a screen apart before, it is best to find some help from somebody who has.