From time to time, take your mug home for a thorough clean, unless you are using it to grow cultures for a lesson. Teachers are notorious for a rinse-and-go mentality to crockery. Unless you want your school to be mentioned on the six o'clock news as the source of an unpleasant outbreak of unfriendly bacteria, get into a healthy relationship with your mug and introduce it to your dishwasher.
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