I do this as well, but I legitimately have stringy stuff there from what I've been told is actually an allergy to my contacts or solution. It's very hard to stop because you don't want people to see the stuff in the corner of your eye and you can feel when it's there.

Do you know if it's an allergy thing for you too? No meds help me and I should probably just go back to wearing glasses, but I love wearing contacts.