best ways to clean thermos

Best Ways To Clean a Thermos Flask

Nowadays, an insulated thermos flask is available in all ranges because of its affordability and features. It is pleasant to carry and maintain the temperature of your beverages for a long time. But because of its construction, it creates problems to clean it properly. Therefore, the coffee, tea, and other drinks you keep cause it discoloration of the metal inside. However, there are many excellent ways to rid your flask of unsightly stains so, let’s dig into it.

1. Use Baking Soda And Vinegar

These ingredients are common, and you can easily find them in your kitchen or any nearby shop. So, to clean your thermos flask, see the following procedure that we have mentioned below.

Step 1: Taking baking soda and vinegar, then keeping that into the flask

It would be best to take a cup of distilled white vinegar amounting to 120 ml and pour that into the stained flask in the first step. When you are done with it, shake in 15ml baking soda and keep doing as per the per cup capacity of your thermos flask. And now you require to combine these two elements; to do this, use a sink.

Key things:

Vinegar and baking soda are two excellent germs killers when you mix them.

If you want to clean your thermos properly. In that case, you should use white vinegar only because it has more acidic features and is better for cleaning. Aside from this, it will also leave a few odors or tasks in the flask.

Step 2: now fill the hot water into the flask

After the fizzing baking soda, there may be some portion of it left, so to remove these, you can use hot water and fill it into the flask. As a result, the loosened dried stains from the inner surface will come out. The distribution of soda and vinegar will become better. Keep the cap off because it will help in maintaining high pressure to the top of the thermos.

Key thing:

Baking soda and vinegar reach each other, so keeping the cap off. It can be the reason for massive leakage and a bit of internal damage as well, so keep this point in mind while practicing this tip.

Step 3: Leave the flask for 8-10 minutes.

After implementing the first and second steps, you can leave the flask for 8 to 10 minutes. Till then, the baking soda and vinegar solution will keep working. And the heat of the water will remove every discoloration, and it will make it worse.

Key thing:

If you think that the discoloration level is higher, you can leave the solution for a few minutes.

Step 4: Use a brush to scrub inside of the flask.

You can buy a scrubber to scrub the flask from inside. Many brushes available are designed for this task only, so you will not have to spend a lot of time finding them. Its tall structure helps you to clean the thermos from inside correctly without causing any damage.

Key point:

Be sure to do this step and use the dishwasher for the final cleaning of a stained flask.

Step 5: Pour out the solution and wash it with water.

The final step says you need to pour out the solution that you mixed up earlier. When the mixture comes out, wash it with hot water until no vinegar or baking remains. Do not forget to do this step carefully and when you get done with it, then clean it with a soft towel.

Key thing:

You should clean the body with a soft towel and let the air get dry.

Keep the flask thermos filled with hot water until the smell of vinegar solution becomes odorless.

You can also use the below-mentioned methods to clean your flask thermos.

2. Use Lemon Juice

Lemon juice also has a cutting element that helps clean the surface of the thermos. So, if you want to use this remedy, it requires you to squeeze a few tablespoons of lemon juice into the flask along with a glass of water. Now you can mix it well by shaking for a few minutes, and later it gets risen with water. The lemon juice is capable of ridding your flask stain and order accumulated inside of it.

Apply Tea Bags

If you are looking for a successful method that is also powerful, then you should use teabags. In this method, you need to take hot water and pour it into the flask with a teabag. And now leave it for overnight and in the morning take out or empty the water and teabag mixture and wash it with tap water. If you do this, then you will get impressive results with minimal effort.

Get Denture Tables And Use

Denture tablets are a gentle and easy way to clean the flask thermos at home. It is also a secure method because you need hot water into the thermos flask along with a denture tablet. After this step, leave the bottle open without a lid. The mixture will react well, and foaming will start coming out. You need to keep it in the same condition for 30 minutes, and then you can rise with tap water security.

Use Ice Cubes With Salt

You can also use the salt and ice cubes together to get rid of the thermos flask. Here you all need to use ice cubes that hold up to 1/4 portion of the thermos, and you can also use crushed ice that is similar in size to ice cubes. After keeping the ice cubes into the thermos, you need to add two tablespoons of salt and cap it. Now the central part is to shake gently, so keep doing this for 2 minutes continuously. You can repeat or do this activity for a longer time if the thermos flask discolorations are high.

Aside from doing this, keep in mind that it reaches every corner of the thermos and leaves it for a few minutes. After a few minutes later, clean it with tap water. The best thing about this method is you can do it on a weekly or monthly basis.


So, now you need not worry about being a coffee addict and cleaning process. Use these methods and keep enjoying your beverages without causing odor or any related issue.

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