The infrared sauna was what I used to get rid of my sinus issues. I barely have them anymore. If you can get in one you can fry what ever is in there. It may not be bacterial, it could be parasites or fungal.
I also put antifungals in my netti pot and I did an herbal parasite flush. I swear I had all kinds of stuff living in my sinuses, a whole community. They got evicted, but it took time and the sauna to do it.