How to clean a Thermos Flask inside the Easy Way without damaging it

How to clean a Thermos Flask inside the Easy Way.
How to clean a Hydroflask inside without damaging it.
Clean the hard to reach inside of your Metal Thermos Flask that is stained with Coffee & Tea. (You really need to wash them out after every use to remove grime and spots from your steel flask).
There are lot's of ways for metal flask cleaning but some will damage your flask, thermos flask cleaning with bleach is a bad idea and not good for your health. This Thermos cleaning tip is a nice easy fix.
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