Beverages tend to taste really bad if they were being filled and come out of thermos flask that has not been used for a while. The reason is because the trapped air in the confined thermos or vacuum flasks can become stale when they have not been used for a while. In Malaysia, it will be advisable to check if any insects have made their nests in the uncovered flasks. So, before you fill your thermos flask, be sure to get rid of the insects and also the stale smell.
So, what is the trick to freshen your stale-smelling thermos flask? Dump a teaspoon of salt and a tablespoon of vinegar into your stale thermos flask. Close the cover and shake thoroughly. Then rinse these ingredients off with fresh running water. Smell the flask. It should smell fresh. If not, repeat the process and this time, a little longer.
Another secret technique to freshen your thermos flask is filling it with two teaspoons of baking soda. Pour in boiling water and close the cover. Leave it to alone for at least 8 hours. This means that you can perform this procedure before you leave for your work and when you return, the flask should be ready with its newfound freshness. Be sure to rinse out the thermos flask with dish-washing detergent and water.
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