Makes sense if it's not well done, thanks for sharing, but keeping the viruses inside the nose means they will multiply and spread to the lungs in few days anyway, while cleaning the nose correctly with marine salt-water based could prevent viruses spreading inside the body. I'm doing nasal infiltration since about one year and never got water into my lungs, sometimes maybe into my mouth.
I've heard from a previously infected person with COVID that doctors told him he got the infection inside his sinuses, then I made a connection with cleaning the nose a bit better than usual. It's all about the viral quantity we are inhaling, more we get more we are prone to get a viral disease.
Meanwhile some sites are saying that could help somehow:
https://www.bbc.com/news/uk-scotland-edinburgh-east-fife-53170734 and
https://www.ed.ac.uk/usher/news-events/news-2020/salt-water-solution-could-treat-covid-19-symptoms, some others that don't:
https://www.who.int/emergencies/dis...qrhBzYoQSYvagVU3_TdhIjzsBoCFNIQAvD_BwE#saline. What's important here is to do our best to stay safe and remain healthy!