Cleaning a Thermos Flask

by Amy Gordon
(last updated August 20, 2018)

1

Like bottles, thermos flasks prove to be extremely difficult items to clean. They are often deep and the bottom is very hard to scrub. Maybe one day someone will make a specially designed tool to clean the inside of a thermos, but until that day comes, we have to make do with the tools that we have.

With almost any sort of cleaning task, the most basic items to use are soap and water, so let us start with those. I find the easiest way to clean a thermos flask is to pour hot soapy water into the bottle. Allow the soapy water to soak for a few minutes.

After the thermos has been soaking in water for several minutes, find a small dishcloth and a wooden spoon with a long handle. Wrap the dishcloth around the end of the wooden spoon. Push the cloth end against the inside of the flask, starting with the neck of the thermos. If you twist the spoon in the cloth, it will help make a bigger scrubbing tool. Make sure to rub the entire interior of the bottle. The hardest part is still the bottom of the thermos, but if you rub around enough of the bottom, everything should come right off.

To get the cloth out of the thermos, tip it upside down and coax the cloth out using a combination of shaking the flask and prodding the cloth with the wooden spoon. It should come out fairly easily. Finish off the job by rinsing the now clean thermos flask.

Another idea for cleaning your thermos flask is to fill it with very hot water and add four Polident (denture cleaning) tablets. Let it sit overnight and rinse it out in the morning. A thorough rinsing job should remove the need for scrubbing on the inside.

Do not store the flask with the lid tight between uses. It is best to leave the lid off to help prevent odors from building up, especially if the thermos is at all wet inside. That moist, warm, dark environment is perfect for bacteria growth, which will mean you have to clean the thermos out again before use.

Author Bio

Amy Gordon

Amy Gordon loves keeping things simple, natural, and safe so she can spend more time having fun. Every day she learns new things about making life at home easier and she loves to share it with you! ...

MORE FROM AMY

Make Cleaning Doors a Priority

Doors get touched constantly. They need to be cleaned as much as any other surface in your home since they easily pick up ...

Discover More

Remove Heavy-Duty Stains on Stainless Steel

Here are two methods for removing stains from so-called stainless steel. You can remove most stains with a mixture of ...

Discover More

Removing Wax Stains

Most wax stains will have to be removed by freezing the wax then scraping it off. If you cannot remove some of the wax, ...

Discover More

Tough Tools for Tough Cleaning Jobs O-Cel-O sponges and Scotch Brite scrubbers are truly a fashion-meets-function success story. The highly absorbent and durable sponges in this handy six-pack make quick work of tough cleaning problems in any kitchen, bathroom, or garage. Check out Scotch-Brite Heavy Duty Scrub Sponges today!

More Cleaning Tips

Water Cleaners

Most of us don't consider the cleanliness of the water we ingest as much as we should. By using a water filtration ...

Discover More

Cleaning Rubberized Watchbands

There is one part of a watch that always seems to get a little dirtier than another, and that is the watch band. ...

Discover More

Cleaning a Baseball Glove

Baseball gloves are an integral part of America's traditional pastime, baseball. However, they also tend to be a bit ...

Discover More
Subscribe

FREE SERVICE: Get tips like this every week in Cleaning Tips from Tips.Net. Enter your address and click "Subscribe."

View most recent newsletter.

Comments

If you would like to add an image to your comment (not an avatar, but an image to help in making the point of your comment), include the characters [{fig}] in your comment text. You’ll be prompted to upload your image when you submit the comment. Maximum image size is 6Mpixels. Images larger than 600px wide or 1000px tall will be reduced. Up to three images may be included in a comment. All images are subject to review. Commenting privileges may be curtailed if inappropriate images are posted.

What is nine more than 5?

2018-09-04 17:47:44

John P

Good to know. Just got sparkling clean with Polident. Am leery about the non-steel parts. Will my leak-proof seal succumb to the chemicals or is it cool to soak and clean as I did with the body of my flask? Thx!


Newest Tips
Subscribe

FREE SERVICE: Get tips like this every week in Cleaning Tips from Tips.Net. Enter your address and click "Subscribe."

(Your e-mail address is not shared with anyone, ever.)

View the most recent newsletter.