Most people think a quick rinse and wipe keeps germs at bay, but it isn't enough to tackle the bacteria that build up, especially once cream or sugar have been added — both contain nutrients that feed bacterial growth, and the oils and proteins in milk or cream need actual soap to remove, not just water.
How Often You Should Really Wash Your Coffee Mug
A lot of people have a special relationship with one particular coffee mug — and don't wash it nearly often enough, especially during cold and flu season. A mostly empty mug, left to its own devices, can grow some pretty scary stuff, and cold and flu germs travel easily onto a shared cup.
A Rinse Isn't Enough
Wash It Properly Every Time
Wash your mug with soap and water after every use, using a paper towel rather than a sponge (a sponge can transfer E. coli or salmonella right back onto the cup). Dry with a paper towel, and don't forget to wash the lid if it has one.
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