Question:
Can I rub my eyes or remove eye mucus/crumbs/”sleepies” on Shabbos? What if in the process I will be removing black eye makeup that got stuck to the mucus and is now unwanted because its off my eye?
Answer:
You may rub your eyes and remove any dried mucus. Additionally you may also remove dried makeup with you fingers or water, but not with a wet cloth or tissue because that would be sechita.
Sources:
It is not an issue of tzovaya, because there is no issue of removing color that has no meaning, only when it is a picture of something or a letter. It is not an issue or borer because it is on the body, and because it is something that it is the normal cleaning of the body. See Orchos Shabbos 15-59, ftnt. 85, Shmiras Shabbos Khilchoso 3 ftnt. 7.
