How do you get rid of coffee stains in a Thermos flask?
@bascht with sponge and soup I guess
@bascht Sterilising solution. In the UK you can buy this wherever you'd buy home brewing stuff.
@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.
@bascht just don’t look inside :).
@bascht Like the stain of sin, these can never be washed away by human toil.
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