I have been using the 3% Hydrogen Peroxide spray that I made myself with 12% food grade HP. It seems to keep my sinus clear. I was taking Rhinocort once every two weeks but so far I haven't needed since I have been doing the 3% HP spray. For some reason the sinus on the side where I sleep is blocked when I wake up in the morning but it clears up as soon as I get up. Would it be better to use one drop of the 3% HP in each nostril for your sinus?