Clean thermos bottles properly: How to get them clean again!

Thermosflaschen richtig reinigen: So wird’s wieder sauber!

Thermal containers are not only environmentally friendly and sustainable, but also extremely practical. Because what could be nicer than sipping warm tea or coffee in freezing temperatures, or enjoying your lunch break with a cool lemonade?

But how do you best care for them and avoid unpleasant smells? We'll show you some proven methods and tips to keep your stainless steel thermos bottle in shape.

But why stainless steel?

Stainless steel is not only robust and durable, but also corrosion-resistant. It does not discolor, does not absorb flavors or odors and is free of harmful chemicals. This makes stainless steel the ideal choice for thermal containers and insulated bottles.

Clean thermos bottle

Cleaning made easy

Basically, you should rinse your thermos flask with water after each use and let it air out and dry well.

  • Hot water:
    Fill the thermos bottle halfway with hot water. Add a small drop of dishwashing liquid, close the bottle tightly and shake gently.
  • Tried and tested home remedy: vinegar or baking soda
    For stubborn odors or buildup, add a teaspoon of vinegar or baking soda to the water.
    Both are natural cleaning agents that can effectively neutralize odors. Let the mixture sit for a few hours or overnight. (Caution: foam formation / do not combine with dishwashing liquid).
  • For coarse dirt: brush
    If it gets coarser, the only thing that usually helps is a bottle brush or a narrow brush with soft bristles. Make sure to reach all areas, especially the bottle neck and lid. Rinse thoroughly.
  • Allow to dry thoroughly
    Be sure to let the thermos dry thoroughly by storing it in a well-ventilated area with the lid open. Avoid capping the bottle before it is completely dry to prevent bacteria or odor from forming.

Clean thermos bottle

Can you clean thermos flasks in the dishwasher?

A trip or two in the dishwasher shouldn't be a problem. In general, we always recommend hand washing. There are reasons for this: seals can harden, the paintwork can fade and plastics can become dull.

Odor prevention tips

We know it ourselves, water alone can sometimes taste a bit bland. However, this minimizes the formation of odors. Other drinks, especially those with strong flavors, can leave behind odors.

Avoid milky or high-protein drinks: Milk and high-protein drinks tend to produce odors and buildup more quickly.

As mentioned above, make sure your thermos is completely dry before sealing and storing it.

Clean thermos bottle


Stainless steel thermoses are great companions for those who travel a lot. With the right care and cleaning, it is easy to ensure that your bottle always stays clean and odor-free and that you can enjoy it for a long time.

Are you still looking for the right bottle? Then take a look at JACO or UMBERTO ! :)

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