Adding to this. It might not be betadine but rinsing the nasal passages with distilled water, nasal irrigation salt packages (neilmed for example), and a dash of apple cider vinegar will do much the same thing. And they can’t ban vinegar. Can they?
COVID CRIMINAL!
(Heh, in all the years I have been on FR, I have wanted to use that image in some context...this seemed to fit!)