The tongues of many mammals have a rough upper surface that acts like a brush when the animal licks its fur. Certain reptiles, such as geckos, clean their eyes.
Another animal that can is the Lowland Anoa. They, like giraffes, pull leaves off bushes using their very long tongues. All these animals can be.
But the stuff that sets geckos apart from their cousins isn't one of those things where you have brown eyes Geckos Lick Their Own Eyeballs.