Anti-Covid19 nasal spray?

Over the last few days, several major newspapers have reported on an Israeli-made nasal spray to protect against Covid19. You may have read very encouraging preliminary results for a nasal spray that protects against Covid19, which is being studied at major American research centres. However, this solution is still in the study phase and NOT yet available!
Today in Israel, as in Italy, several protective nasal sprays are available, but NOT specifically for Covid19. They contain natural mucilage which, sprayed evenly into the nose, helps to 'trap' atmospheric dust and thus the viruses and bacteria that travel with it. This is a kind of natural barrier, generally very well tolerated, which helps the mask you are wearing to work.
Here is a small selection of them: they are all medical devices based on the same principle, and their (partial) protection also applies to the flu virus. For more information, ask at your pharmacy.