I don’t know about pink eye, but I discovered something we’ve been trying. It’s called Usnea, and it’s sold in health food stores as a tincture. Basically it is a lichen, soaked in a clear liquor such as rum or vodka. It’s good for upper respiratory ailments, sore throats, uti’s, etc.
Bump for reference.
I just read a little about Usnea. Never heard of it before. Do you use it every day to prevent colds? They don’t list any drug interactions, but mention liver toxicity in a few places. Be careful if already taking things like statins.