Now think about covid mask hygiene.
I like this example. This j if the mask people are wearing in the grocery stores. Immediately after putting it on cover the outside with chocolate syrup. By the time they leave the store having touched/adjusted the mask repeatedly, where is the chocolate syrup? Now to go further they take the mask off and put it in their pocket/purse/dashbioard etc. By the time they get home where is the chocolate syrup? This is his masks can help spread infection