my ears were itchy recurringly for probably a year or more. I too would use the hydrogen peroxide, which helped some, but not much.
sometimes it would be really maddening -- so I very gingerly put a drop of "Oreganol"
(it is already diluted, and was all the local health food store had) on a Q-tip and twirled it as deep as I dared go.
It did burn, but I wasn't too concerned. It felt like it was working. That got rid of the probelm for months. Now I get the itch occasionally, but nothing like before, and I just bought some pure oregano oil. I'm going to dilute it probably in olive oil. Not sure how much. Maybe 1:11. First I have to test the oregano...