Can anyone remind me what the current best nasal sprays are for COVID (or other) defense?

Bonus points if there are any safe for preteen-age kids!

[Feel free to boost.]

UPDATE: see comments for some good recommendations and advice! (If you don't see any, click "open original page" from the three dots.)

#CovidIsNotOver

brb, hyperventilating slightly that I just accurately referred to my child as "preteen"