And a novel approach of deactivating the Covid 19 virus right in the mouth:

At a time when pharma firms are jostling with each other to find a cure to COVID-19, a Swedish life science company, Enzymatica, claims its mouth spray ColdZyme can deactivate SARS-Cov-2 or COVID-19 by 98.3 per cent in just 20 minutes. The primary results of an in-vitro (lab test) study of the mouth spray have shown that ColdZyme acts as a protective barrier against COVID-19 and other viruses by deactivating it in "oral cavity", the company has said.

https://www.businesstoday.in/coronavirus/this-swedish-firm-claims-its-mouth-spray-can-deactivate-coronavirus-by-983-in-20-minutes/story/410443.html