Interesting. I do the saline flush on a regular basis, as I have always had sinus troubles. Never tried iodine in the nose. I have actually tried a VERY dilute apple cider vinegar in the nasal flush. Very unpleasant, but works wonders at night.
I only do it when I come home from excursions. I am weird about things messing up the nasal passage.
You can do research and see ENT drs and dentists doing this with patients.
Also, saw a post on Texags by a DR saying he tells people to use baby shampoo rinse in nose as a regular matter..i think it was after surgery but dont remember
So I also put some gentle soap up there with my finger and let it sit for about a minute