Cleaning a thermos

bouicca21

Not sure if this is the right bit of the forum but hoping the collective wisdom will set me right.

I have been using a small thermos flask for tea. I drink mine black and the thermos is getting stained (internally) from the tannin. Any ideas on how to clean the stain off?

Loanranger

Washing soda crystals and boiling water.

Loanranger

And rinse very thoroughly!

Gers

Milton solution
Denture tablets

Davy_Jones_II

I used steradent on a thermos mug, and it came up as though it was brand new.

Two tablets in the bottom, boiling water added from a kettle, and left it overnight.

Carrot007

Seems a bit wasteful to bother to be honest. If it does not come of with a simple wash in the sink it is not doing anyy harm.

Loanranger

Carrot007 wrote: »

Seems a bit wasteful to bother to be honest. If it does not come of with a simple wash in the sink it is not doing anyy harm.

Except it tastes horrible and the drink is tainted.

Gers

Carrot007 wrote: »

Seems a bit wasteful to bother to be honest. If it does not come of with a simple wash in the sink it is not doing anyy harm.

It's tannin, tastes nasty, looks rubbish and is unnecessary. Look what it does to people's teeth and tea cups / mugs. Yeugh.

A simple soak every so often is all it takes, easier than washing it.

bouicca21

Thanks all. The tannin stain looks horrible and should be cleaned just for that reason, but I think it will transmit the taste to other liquids, so I want rid for that reason too.

McKneff

Bicarb. Rinse well

comeandgo

Yup, bicarb of soda added to boiling water, close flask, let it sit until water cold then rinse. The tanin comes off in strips.