@ikuo1000 Any prevention actions are better than none, but I want to be clear that I would never recommend something "instead of" masking. That said, I'm in the US and use a xylitol nasal spray and CPC mouthwash in addition to masks. Both are safe for multiple daily uses. Sounds like iota-carrageenan nasal sprays like Nasitrol are equally safe to use several times a day.
Once my xylitol spray runs out, I'll be switching to hypochlorous acid (HOCl) for both nasal spray and mouthwash (CPC can turn your teeth brown). HOCl is cheap to DIY at home and is surprisingly safe and effective.
https://pubmed.ncbi.nlm.nih.gov/34236253/
Indoor air filters such as Corsi-Rosenthal boxes and just general air circulation and ventilation would of course also be helpful. I would basically be pushing every other prevention method if someone will not mask.
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