I have found that playing the didgeridoo twenty minutes a day pretty much eliminates all nasal congestion. It gets rid of that shit in your throat too.
I think it is the vibration. It is essentially amplified humming. I did teach my self to circular breath, and that opens up something up there that needs to be opened up.
I own a neti pot, and actually two other nose-cleaning devices, but when I am diligent with the didge I don’t need them. It’s better than any allergy medicine I’ve ever taken (although I do take an anti-histamine most days too).