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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People ITT have some overcomplicated suggestions. A bleach/hot water mix and an hour of soak time will make metal thermoses shiny and new again – strips off years of coffee patina.
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