These are solutions to two completely different problems. The valsalva maneuver (holding your nose while blowing out from your nose) can equalize the air pressure in your middle ear, which is behind the ear drum. The warm water/peroxide helps with was build up in the outer ear, outside of the ear drum. There's no reason why both would be used for a single issue since they are unrelated problems and only one of these has any relevance to each problem.