When I had a Keurig, there were two little blue LEDs under the water tank. Every once in a while, I would notice some little green bits of algae (or something) would grow on the bottom of the tank, directly above the lights. They kept coming back even after I would thoroughly clean it.
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You might want to read about the really nasty bacterial films that grow inside Keurig machines, and which can't be removed.
The office coffee pot can at least be cleaned. And so can all the various hipster drip systems that are en vogue right now.
When I had a Keurig, there were two little blue LEDs under the water tank. Every once in a while, I would notice some little green bits of algae (or something) would grow on the bottom of the tank, directly above the lights. They kept coming back even after I would thoroughly clean it.