If you are a regular coffee drinker you may notice stains start to build up on your mugs, thermoses and coffee pots. Brown coffee stains will start to form on anything that coffee sits in for a while.

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Whose bright idea was it to make the insides of coffee mugs white? As a specialty coffee expert, I'm all too familiar with coffee stains in general, but especially the ones that mark the insides of my ...

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