I'm sorry that you had to put him down, but you really tried to help him. Sorry that I haven't been on to see your posts lately. I don't know as much about bird anatomy as human, but we have eustacian tubes that connect the throat with the ears, and that is what gets stopped up when we get an ear infection. The eustacian tubes help us equalize pressure in our ears, so it is probabvly normal that the peroxide came out his beak. Take care.
Thanks, Eggcessive. It looked really weird when they peroxide came out his mouth and seemed to really bother him. What you said about the eustachian tubes makes sense though.