I had had clogged and inflamed sinuses on and off for the last 20 years. Iodine is an inexpensive natural substance that is antiviral and antibacterial. I use about 5-7 drops of Lugol's food grade Iodine in a diffuser with distilled water and I run it all day. I think my infections are due to damage I had on my sinuses from inhaling pesticides and caustic chemicals over the years with my work. Now I'm am in my late 60s. I inhale the vapors when I pass by, and for the most part, I keep the diffuser running all day near my work space. It kills bacteria that causes infections and it helps. I learned about Lugol's iodine from a chiropractor when the covid virus started. To run an iodine diffuser in the home was a good way of keeping the virus from taking hold in the mucus membranes in my sinus passages.