Cleaning screen without removing coating

Any ideas on how to clean the display without removing the coating? My screen protector has been off for a while and there are drops of dried water (eat around my computer everyday) that when I rub they detach off the spot they were stuck to but then slide and get stuck somewhere else. I have been tempted to use water to clean cause I think the fostungbeoudl still be intact but I wanted to hear from you smarter users. Thanks

I use the cloth that came with the Dbrand skin to wipe the screen all the time.