5 Ways to care for your insulated flask

cleaning an insulated flask

The rising popularity of flask usage in the Philippines has been a hot topic online. With the country’s tropical climate and warm weather, people are looking for ways to stay hydrated. Flasks are an easy way to carry cold drinks around and keep them cool for longer periods of time. Coffee and tea are popular choices for keeping your flask cold, but they also leave behind an unpleasant smell that many users find unpleasant.

If you’re looking for a way to remove the smell of coffee or tea from your insulated flask, follow one of these simple techniques.

5 Techniques How to Remove Coffee or Tea Smell in Tumbler

One of the best ways to keep your vacuum flask clean and sanitary is to regularly clean it. Whether it’s a coffee- or tea-smelling flask, you can use these methods to remove the smell and keep it solid.

1. The Sour Salt Technique 

According to a 2014 research, citric acid is naturally present in the largest amounts in citrus fruits like lemons and limes. Tomatoes, pineapples, oranges, grapefruits, tangerines, oranges, and strawberries are some more natural sources.

Citric acid is a useful component of cleaning goods since it effectively kills hazardous microorganisms. Moreover, it possesses brightening qualities that are beneficial for removing stains. Commercial cleaning products may contain citric acid as it can assist in removing hard water setup on tableware and furniture. Moreover, it can be used to eliminate stains caused by coffee, tea, water, and urine, as well as fading and browning discolorations.

An organic component from citrus fruits is called citric acid powder. Some definitions apply to it as “sour salt” since it has the appearance of salt. It’s a great method to clean your tumbler and get rid of bad odors without having to worry about dangerous chemicals. Additionally, it acts as an effective solution for coffee makers.


  1. Citric acid powder 
  2. Clean hot water 
  3. Towel


  1. 1 teaspoon of citric acid powder should be added to 1 cup of hot water in your tumbler. 
  2. Give everything a vigorous shake to combine. 
  3. If your flask is a bigger one. Add one or more tablespoons of citric acid powder with another cup of hot water. 
  4. Let it to sit for about one or two hours before emptying it out. 
  5. Rinse completely, dry with a towel, and then leave the lid off to dry naturally. 

2. The Dishwashing Detergent Technique

Your flask should remain fresh-smelling and bad odors should be kept under control. Dishwashing detergent has the power to eliminate powerful odors and leave your flask spotless after each use. If you are careful to clean your tumbler thoroughly after each use, you shouldn’t experience an odor issue. 


  1. Dishwashing detergent 
  2. Warm water 
  3. Bottle brush


After you’ve finished your coffee, thoroughly clean your insulated flask with heated water and dishwashing soap. 

Use a bottle brush to scrub the interior thoroughly, being sure to get into any tight spaces that are ordinarily difficult to access with your hand. Rinse thoroughly and let air dry.

Users of insulated flasks have also discovered that topping it off with water after applying a scoop of regular dishwashing powder works nicely. After about an hour, let it sit for a while before washing it with clean water.

3. Using Salt and Ice Scrub Technique

Clean the insulated flask component thoroughly with natural cleaning supplies. All people will enjoy this cleaning tip. To safely and environmentally friendly clean a flask, use salt and ice. This approach may need some planning on your part, but it’s worthwhile. 


  1. Table salt 
  2. Ice 


  1. To fill your bottle halfway, crush enough ice (It is better if it fills only half the container). 
  2. To the ice, add between 3 to 4 cups of table salt. 
  3. Shake the flask a few times after covering it with the lid. 
  4. The ice and salt will “scrub” the inside of the flask as a result. 
  5. It will successfully eliminate all dirt and stink. 
  6. Rinse carefully after discarding the salt and ice. 
  7. Allow to dry by air.

4. A Tablet Of Antacid Technique

After fatty meals, antacid tablets can help you feel better by regulating the excess stomach acid. Even if your coffee doesn’t contain any acid, you can still apply antacid tablets to get rid of odors and stains.


  1. Antacid tablets 
  2. Clean water


  1. Fill your flask with water and 4 antacid tablets(depending on the size of your flask).
  2. To guarantee a good mix, put it back on and shake it a couple of times. 
  3. Allow rinsing for a minimum of an hour. 
  4. Give it a thorough rinse before letting it air dry.

5. Baking Soda and Vinegar Technique 

There are very particular ways to blend vinegar and baking soda when cleaning. Baking soda releases carbon dioxide gas when it is dissolved in vinegar. While cleaning, this gas may effectively remove filth and bad odors. When the vinegar and baking soda combination is still boiling, it is ideal to clean.


  1. Vinegar 
  2. Baking soda 
  3. Bottle brush 
  4. Warm water 
  5. Microfiber cloth (optional)


You will need ½ to 1 cup vinegar, 1 tablespoon baking soda, a little warm water. 

The vinegar and baking soda mixture foams up. Making the combination above the faucet will help you prevent spills.

  1. Fill it with vinegar and baking soda. 
  2. Shaking the baking soda over the vinegar is the secret to getting the chemical reaction to happen gradually. 
  3. Then, after the fizzing and foaming have subsided, fill with heated water. 
  4. It must be fully stocked. Because the vinegar and baking soda mixture is quite reactive, do not replace the lid. 
  5. Allow the ingredients to work on the coffee stains for 15 to 20 minutes. 
  6. After that, take a bottle brush and thoroughly wipe the interior of your flask. 
  7. The bottle should be emptied and thoroughly rinsed. 
  8. To make sure no vinegar or baking soda is left behind, it is better to rinse with hot water. 
  9. It can be cleaned with a microfiber cleaning, but you have to let it air dry. 
  10. Repeat the last steps until there is longer any vinegar scent if it persists after rinsing.

Make sure to constantly maintain your flask clean after each use for the best chance of keeping it odor-free. Follow the guidelines above to maintain your insulated flask clean. 

Cleaning your insulated flask after each use is the finest and simplest way to maintain it odor-free. Always rinse off your flask right away or a few minutes later to prevent mold growth or lingering liquor. So now that you are aware of these methods, you may eliminate the smell of coffee.