here is why
https://www.dailymail.co.uk/health/article-8433317/Coronavirus-infect-nostrils-easily-lungs.html
I cant do the netipot thing but I am using Nozin..which you can now only buy directly from them.
wouldnt use it often because it probably damages the lining of your nose if used too much
Neil Med Sinus Rinse unit. Been using it for decades. Once to twice a day.
Well, I’m a mouth breather myself so there’s that............. :-)