I haven’t heard of that nasal spray. I have been using the Xlear spray.
Xlear does the same thing except it doesn't kill, it keeps microbes from attaching to the mucosae membrane. It simply never allows it in.
Silver Biotics ointment in the nose and ears works too. The liquid can be used as eyewash.
A friend of mine developed Covid-19 pneumonia and was going downhill until she dissolved a Honey/Silver lozenge in hot tea and drank several cups a day.