If he got water in his ear during bath time, the best way to relieve it is to put a couple of drops of isopropyl alcohol in his ear. That will take care of the problem.

The reason I give this advice is because when I was showing my cats, I gave my cat a bath and later he began to yowl like he was in pain. I did exactly what I told you to do and it took care of the problem.

Hope everything works out okay.