I have stated many times that masks are one of a few things that could use a training lesson. This could possibly be done with signs but TV might work good as well. There is also video streaming but I doubt a person who is willing to NOT cover their nose, would take the time to download anything. Obviously the anti-nosers know full well they are not doing it right.
My training snip its would look like this: (this is not rocket science)
NOTE: Mouth/Nose transmission directly to the Mouth/Nose of another, is the most dangerous and deadly form of infection that one will receive during this pandemic. If one exposes themselves to this type of virus transmission, for a prolonged amount of time, anyone, of any age, of any health status, can become very ill, experience long term disability and may die. Social distancing (SD) is the best way to prevent this, but whenever SD cannot be maintained a mask should be used by all.
1) A mask should be of a multi-ply fabric, if possible. Cotton works well. It should fit well over your nose and chin and the more one can prevent air from flowing through the sides, the better.
2) Never touch the front of the mask where your mouth and nose are. If a mask needs to be repositioned, it should be done from the edges and done as little as possible.
3) A mask should be able to allow for normal breathing.
4) A mask should be removed from your face as soon as social distancing can be resumed. When removing the mask, look down, shut your eyes, hold your breath, remove the mask slowly from one ear to the next, holding only the straps. Now disinfect your hands.
4) A mask should be changed as frequently as possible.
5) Used masks should not be reused for a minimum of 10 days or they should be washed with soap and water.
6) Most Important: A mask cannot prevent infection to the healthy wearer. It can only reduce the severity of the infection one might obtain to a less harmful, more manageable infection that your body may be able to deal with. Therefore, it is imperative that you use them when social distancing cannot be assured and that you reduce the time, within proximity of others, to as short as possible, EVEN WHEN WEARING A MASK.
Added: Keep in mind that if your mask stopped any viral transmission, not only will it be covered in active Covid-19, but also contaminated will be your clothes and especially your shoes. Outdoor clothes should not be worn throughout your living quarters and hands should be washed/disinfected each time you touch your outdoor shoes.