I just posted about my one eyed chin Davy. Well, right now after play time he got into a corner he shouldn't have and now his non-eye had some sticky gray gunk on it. I tried taking it off with my fingers and then a tissue, and I succeeded for the most part but the fur surrounding his non-eye is still sticky and theres a bit still there. I put him back in his cage and he was just sitting there with his hands and teeth on the bars, and he was making a grinding sound too. I'm worried, because his eye doesn't look good and I think he's in pain. What do I do?