Masks do nothing. Touching infected objects and then touching the face is what is spreading Corvid. No matter how much a store/shop cleans, a Corvid positive client can touch those places and a Covid negative person can touch them before the cleaning crew goes back over those spots. Then people touch their eyes or rub their nose and new case. I detailed my Wife and my protocol on a number of threads. We are disease free.
i don't know what your protocol is but we don't shake hands and always use hand sanitizer after every encounter in a public place.
No, that's not correct. The church choir (and 100's of incidents since) proved that it spreads by air.