I’ve seen some good ideas with a salt pipe and nascent iodine. You put a few drops of the iodine in the salt and pull it into the bronchial tubes.
That sounds interesting. Where did you see it?
I vaguely remember (gen. anesthesia messed up my memory) something about iodine having many uses that “modern medicine” forgot or discarded.
Nose spray info.
Battling COVID-19 with Enovid Nitric Oxide Nasal Spray (NONS)
https://www.israelpharm.com/blog/enovid-nitric-oxide-nasal-spray/