Replied by Bruce (Ca) on 06/19/2020
Go to youtube.com and type in Bill Monro. He was one of the first advocates of using 3% hydrogen peroxide in a nasal sprayer. The only advice I would add is that Bill had great success with regular HP and I would substitute food grade which is available directly without mixing on Amazon. Good luck. By the way, I use it twice daily as a preventative measure to prevent covid and so far so good!