Other tips are more unexpected. One advises: "Be cautious about accepting the results of a cookery lesson. A sausage roll may look tempting, but remember rolling pastry is very good for getting hands clean."
And another: "At the end of each term, take your mug home for a good clean unless you are growing cultures for a specific lesson. Teachers are notorious for a 'rinse and go' mentality after break and often abandon mugs."
Finally: "If you must lend a pupil a pencil, make sure it's not the one you use for your marking later that night. Chewing on a pencil brings back the memory of just how itchy the pupil's ear was that day."