Yes, it does kill the virus in the nasal passages. I posted a solid clinical study on it some months back. I’ll try and dig it up and repost it.
https://www.businesswire.com/news/home/20210324005241/en/Xlear-Submits-COVID-19-Pre-Emergency-Use-Authorization-Request-with-FDA-Regarding-Use-of-Xlear-Nasal-Spray-in-Help-in-Combating-SARS-CoV-2