When around thermoses not used for coffee it is usually very clearly written on them by the user that it is not to be used for coffee. Ever. Coffee thermoses on the other hand have quite the smell to them even after washing. Why does coffee taint thermoses so bad and why are dish washing products not effective enough to remove all coffee traces?
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My coffee maker has a metal carafe. The inside will turn brown after a bit and hard/impossible to clean. Drop in a dish washer pack, and some water shortly off the boil, let sit 30 minutes, it’s good as new.
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