What do you do if your hamster has goo in its eye?

Is the hamster old, over 2 1/2 years? That sometimes happens, the hamster's eyes get gooey and won't open. Gently hold the hamster and using cotton wool damped with warm water, wipe the eye until the goo is gone and the eye can open. You'll just have to keep doing it, there is no cure, it's a sign of old age.

If it's in a younger hamster, it might be a sign of illness. Wipe it away, and take it to a vet if it gets worse.