Hi bbducks22, you might bath the eye with saline solution.
Make with 1 teaspoon of salt in 1 cup of previously boiled and cooled water.
Dip a cotton wool ball or a small clean piece of old cloth in the saline solution and wipe the eye once, then discard the ball/cloth. Repeat several times with a fresh cotton wool ball or small clean piece of old cloth for each wipe.
It's easiest if you wrap your duck in a towel and then hold him/her against you body with one arm while wiping the eye with the free hand