I tried the hydrogen peroxide, 1/2 cup warm water and 1 capful of the peroxide and I got the worst nose bleeds possible. I do not recommend this. Good thing I didn't do the 50/50!
I have had sinus congestion for the past several days real bad. I decided to try the 50/50 Peroxide/Water mix and squirt in each nostril. It burned like people said on your site and my nose started running like crazy, but it did NOT clear up my sinuses. Actually it increased the pressure in my sinuses so much that I did not sleep well at all, had a sinus headache, and my cheek bones hurt. I would not try that again.