I am sorry if this is a duplicate. I seem to remember posting or emailing this question, but cannot find that I did.
What may I use to clean my Gazelle Ultra display?
Cleaning Display
Archived thread 1049215 from System76 Support. Markdown source: System76_Support/thread_1049215_Cleaning_Display.md
An alcohol solution works best (about 50/50 isopropyl and distilled water). You can get ready made solutions in the form of CD cleaner or eyeglass cleaner. Some may be specifically labelled as LCD screen cleaner.
As long as your screen isn't too dirty, a damp (lint-free) cloth may even suffice. However, you should use distilled water to dampen the cloth as tap water contains minerals that may leave deposits on the screen.
Microfibre cloth works well too.