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It's been suggested to me, in addition to hand washing, to use soap to rinse a bit of my nostrils. Not sure if it makes any difference at all, but I've been doing it on the off-chance.

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I would think this would actually increase the odds of infection via that route since it would tend to dry out the skin in your nostrils and remove some of the natural defenses we have there.

Presumably in anticipation of upper respiratory tract infection. COVID-19 is a lower respiratory tract infection.

I haven't heard of nasal irrigation using soap; hypertonic saline solution is usually recommended.

http://www.elvisstudy.com/

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