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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Coffee grounds are very gritty, and coffee itself creates a very harsh temperature resistant glaze when it dries out. So to get rid of coffee you need not only high temperatures, but also often a decent amount of scrubbing or water pressure, both of which are usually very hard in thermoses. Generally if you have a thermos designed for coffee or very sugary products (mulled wine for example), it will be open top, to allow for easier cleaning, but this makes them worse/more expensive than their “bottle” like brothers.
Use denture cleaning tablets to remove the coffee’s miasma. I used to separate thermos for coffee and tea, but the denture cleaning tablets will remove the stains and the smells with no scrubbing or other intervention
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.
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.
I am using carbonate(I am not sure its name in english but we are using it as a food ingredient)+hot water to clean my coffee thermos. I am putting both of them then close the lid and let it wait for a few hours then just rinse
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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