How to Clean a Vacuum Thermos flask with Stains at the Bottom

Although vacuum thermos flask is good for carrying and keeping your favorite beverages, people always find it difficult to clean the vacuum thermos, especially the stains at the bottom. There are several quick and easy ways to rid your flask of unsightly stains, and most only require basic materials that you can find around the house.

1. Using Baking Soda and Vinegar

Put some baking soda and vinegar into the bottom of your flask.

Fill the flask with hot water.

Let the flask sit for a few minutes.

Scrub the inside of the flask with a bottle brush.

Pour out the mixture and rinse.

2. Using Ice and Salt

Fill your flask with ice.

Add a few spoonfuls of salt.

Close the lid and shake.

Rinse out the flask.

3. Using Denture Cleaning Tablets

Buy a package of denture cleaning tablets.

Fill your flask with water.

Add one or two denture cleaning tablets.

Let the flask sit for awhile.

Rinse repeatedly.