Furthermore, McCullough said that povidone-iodine (Betadine) diluted in water has worked well as a preventative measure against coronavirus. It is gargled and swished then spit out twice a day. He also recommended cleaning nasal passages with the diluted solution. If one is allergic to iodine, diluted hydrogen peroxide also works well, he said.

https://thetexan.news/dallas-covid-1...texas-senator/