They should practice what they preach. For tables rinse with 05. Clorox solution. I even add bleach to my home dishwasher things come out sparkling and 00 grease.
When someone gets sick, they will probably act
. Don't use towels use paper ones as wipes. Rubber gloves should be used when mixing or handling any foods raw or cooked. The black on the pans is built up carbon because the stoves are not regulated correctly plus cooking at to high a temp.