Preventive and Treatment to COVID-19 – Dilute Povidone Iodine or Betadine ( a 1% solution) gargling and as a nasal spray on a regular basis twice a day for prevention and then if you have been exposed or are in early stages use at least 4 or potentially 6 times a day. You can also use dilute hydrogen peroxide or dilute sodium hypo chloride or even Scope of Listerine – obviously do not swallow and spit out.