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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Most thermoses are metal or plastic. Coffee, an acidic substance, etches away at these materials while it sits in them all day (or its residue). This is also why incidentally coffee is mostly made at home in glass carafes and served in ceramic mugs. These items can actually be cleaned easily.
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