When a flask hasn’t been cleaned in a while they tend to have a weird odor coming from the inside and the mouth part as well. If your flask is dirty and you want to clean it, you came to the right place because I am going to show you how to clean a flask the right way.



Cleaning a flask with dish soap

squeezing dishsoap inside of a thermoflaskIf you want to clean a thermos flask with dish soap then you need to do the following. Make sure that you empty the flask so that there is no more liquid inside of it. The next thing you should do is to get a clean damp sponge and squeeze a few drops of dish soap onto it. After that, you should clean both the interior and exterior of the flask.


Now a  problem most people run into when cleaning flasks is that it is way easier to clean the outside and harder to clean the inside.  But don’t worry there are a couple of ways to clean the interior of a flask. The first method you can use is to get a smaller sponge (one that is big but can still fit through the flask mouth) and place it inside the flask (make sure that the sponge is sudsy). Now use a fork and poke right through the sponge, now use twist the fork in a rotation so that the sponge can clean everywhere inside the flask. After doing that you should know to rinse out the flask.


For the second method, just fill up the flask with warm water then add 3tbs of dish soap and 1/2 cup of vinegar and let the interior soak for 10-20 minutes. After that just throughout the water and keep rinsing inside of the flask until there is no more soap left inside.



You can find some more dish soap cleaning tips here.



Cleaning a flask with rice

sprinkling rice inside of a thermoflaskCleaning a flask with rice may seem a bit strange at first but trust me it is very effective. When cleaning a thermos flask with rice you want to make sure that the rice is uncooked. Fill the flask halfway up with cold water then add a few tablespoons of rice into it (you can add some dish soap in it as well). Now shake the flask for a couple of minutes. After shaking, pour out the rice into a separate container to avoid blocking the drain then rinse out the flask.




How to clean a flask with vinegar

pouring vinegar inside of thermoflaskWhite vinegar is great for cleaning and deodorizing areas. So if your flask is not only dirty but also has an unpleasant smell coming from it then you need to clean it with vinegar. To clean your flask with vinegar the first thing you want to do is to pour 1 cup of white vinegar into the flask shake it up and leave it for 30 minutes. Then pour out the vinegar and rinse out the flask. White vinegar is great at removing bad odors it itself carries a strong smell, so make sure to keep rinsing the flask until the smell is gone.


If you are interested in more ways to use vinegar to clean then click here.


Another way you can clean your flask is to mix warm water, vinegar, and dish soap into the flask and let it soak for 30 minutes then rinse it out.




Cleaning glass thermos flask

You can clean a glass flask with the previous methods I’ve listed above. But the best way to clean a glass flask is to use vinegar. So make sure to let the inside of the flask soak in vinegar and warm water. Then make sure to rinse it out properly.


Another way you can clean a glass flask is to put it in the dishwasher, but before you do that make sure that you read the cleaning instructions on the flask to make sure it is safe to do so. If it is safe then don’t use hot-boiling water as this may damage the flask.




How to get Limescale to build up off of the flask

To get limescale buildup off of your flask you need to get a clean damp cloth and add some dish soap to it. Then use the cloth to wipe everywhere on the flask including the mouth. After cleaning the exterior of the flask it is now time to clean the inside. To remove the limescale build-up from inside the flask you need to fill the flask with warm water then add 2 tsp of citric acid and leave it for 45 minutes. After 45 minutes, pour out the water and rinse both the inside and outside of the flask.




Cleaning flask with baking soda

Most Flasks usually start to develop stains especially when you keep drinks such as tea and coffee inside of them. If you have stains inside of your flask don’t worry because I will show you how to get rid of them using baking soda.


The first then you should do is fill the flask with vinegar and warm water. Then add 2 tsp of baking soda into the flask. Now let the mixture sit inside the flask for a couple of hours, then pour out the mixture and rinse the flask thoroughly.




Cleaning a Thermos flask stopper

To clean a flask stopper you need to get a small toothbrush (that your arent using) and add 1 tsp of dish soap onto the bristles. Then place the toothbrush under running water for 1 second and use it to clean the flask stopper. Make sure that you clean everywhere on the stopper. You don’t even have to use dish soap, you can use vinegar or baking soda as well. After cleaning the stopper, you should rinse it off and place it in an area where it can dry.


Another way of cleaning a flask stopper is to use the soaking method. To clean the stopper this way you have to get a small container like a dish or a small bowl and fill it up with warm water and vinegar. You can also add 1 tsp of dish soap to it as well. Now place the stopper inside the mixture and let it soak for 30 minutes. After that, if you see any build-up on the stopper then use a small toothbrush to scrub it off.




How to dry a thermos flask

drying a thermoflask by setting it upside downWhen drying a flask make sure to set the bottle upside down on a thick piece of paper towel or cloth (for a couple of hours) so that the water from inside can drain out. Do the same for the stopper. After a couple of hours, use a paper towel to wipe away the excess moisture from the flask.


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