system
A chat on subreddit /r/pcmasterrace
human
I use a microfiber and a lil bit of water. sometimes i'll use a little bit of lense cleaner that i use for my glasses. lense cleaner usually uses a much weaker solution since there are many different coatings that can be put on glasses
gpt
 I usually tell people to get a microfiber cloth and wet it.  Then wring it out so much that it almost feels dry.  Then wipe your monitor, but don't rub hard.  If there are crusty bits a bit of lens cleaner will help soften it and it will wipe off with little pressure.