How do you get rid of coffee stains in a Thermos flask?

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@bascht they make special chemicals, but if you wanna go more natural use lemon and salt, and a little boiling hott water and swish it around

@JerryRiggs I think I've already reached the end of what's possible with natural solutions. 😁 I had it set up with baking powder and vinegar over night, but that didn't do the trick.

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