of their eyes?

It's not time for him to go to the groomer yet.
My daughter gave him a bath last night, and told me today she couldn't get it out. I told her I usually let the groomer do it, I've never had to, so it's my fault for not asking. I felt under his eyes and was like

It feels like a little stone. We wet it and it still couldn't get it out. He's all clean and smelling good except for the crusty eyes.

What to do?