You can't: Either he enjoys doing this, or he has obsessive-compulsive disorder. If it bothers him, read up on this and ask, "Hey Bro, does it bother you having to wash your face so much? Here's something you might want to read. I love you regardless and maybe you can talk with your physician about this, but only if you want to." That's being a GREAT brother.
Answered 6/12/2014
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