How do you get rid of coffee stains in a Thermos flask?
@bascht Sterilising solution. In the UK you can buy this wherever you'd buy home brewing stuff.
@andy_twosticks Something like https://www.hillcroftsupplies.com/userfiles/products/o_2859-1.jpg ?
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@andy_twosticks Something like https://www.hillcroftsupplies.com/userfiles/products/o_2859-1.jpg ?