The 3% peroxide should be fine - this was just to knockout the fungus
. You may want to put it on with a Q-tip/cotton bud, so it just goes on the infected area. A chemist is what we call a drug store in the UK and the standard peroxide sold here is 6%.
I feel the Neem Oil will help you a lot. I am glad you have watched the DVD's
Have a good day.