Are Thermos Dishwasher Safe?

Thermos products including cups, mugs, and flasks are best suitable for storing food and beverages throughout the day. However, when it comes to washing these products, several questions arise in your mind.

Are thermos products dishwashers safe? How to know that your thermos products are safe to throw into the dishwasher? What could possibly happen if you put your thermos products inside the dishwasher and start a cycle? In this article, we will give you detailed information about its cleaning and washing process. So, without any further ado, let’s unravel everything.

What Will Happen If You Put Thermos in the Dishwasher?

Some manufacturers state that their products are dishwasher safe, but still many recommend using hands to wash them. Washing by hand helps to keep the impressive finish of the thermos. Why is it so?

Indeed, some products require extra care, and the thermos is one of them. Thermos products do not come with an interior coating. When you put thermos containers inside the dishwasher, they are more likely to procure the room between the inner and outer layer that gets filled with water. The heating element can damage your thermos inside out.

How Do You Know Your Thermos Are Dishwasher Safe?

Thermos is not new in the market. It launched the first-ever stainless steel vacuum insulated container. Earlier, there were rarely any vacuum insulated thermos products that were dishwasher safe. With technology and innovation, more and more manufacturers state that their products are safe to wash in the dishwasher.

You can figure out whether your thermos flasks, cups or any other products are safe or not by checking the official website of the manufacturer. Also, you can read the manual guide, where you will easily get direct care instructions.

Remember, it is absolutely inappropriate to use bleaching powder or other cleaner containing bleach on any thermos product. Likewise, do not use harsh detergents or hot water to wash your dirty thermos products. If you use them, they will ruin the original appearance. 

So, if you actually throw your thermos inside the dishwasher for a cycle, the results will vary. Ideally, if you have access to a dishwasher, simply put your thermos products only on its top rack. The top-racks of dishwashers will not affect your products. Accordingly, they will be fine and come out in the cleanest form, just as you would like to view.

However, it is not in the case of the bottom rack of a dishwasher. The bottom rack of the dishwasher is not thermos-friendly. As the heating element remains at the bottom of the dishwasher, it generates extreme heat that potentially smashes the vacuum insulation or vacuum seal of the thermos.

It can possibly crack due to heat generation during the cycle of drying. Hence, they can defect the vacuum seal of your thermos and restrain the insulation layer from working properly.

Some customers also choose the bottom rack to put their thermos and get clean products without any trouble. Yes, they say that it does not cause damage to the insulation.

So, if you want to be on the safer side, it is better to hand wash all your thermos and prevent them from being exposed to heat. It will not only help to increase the lifespan of your thermos but also keep the appearance unchanged.

Do The Dishwasher Covers Under the Warranty Period Cause Damages?

The manufacturers usually offer a five years warranty period on the vacuum insulation of stainless steel thermos. In the case of glassware products, they offer a 1-year warranty period on vacuum insulation.

You can get the benefit of this warranty cover in case the thermos loses the vacuum seal because of any manufacturing defects. However, you cannot acquire the benefit of warranty cover for wear and tear. The company will not replace or repair your thermos free of cost if you neglect, abuse, alter or use improperly. So, follow all the care instructions properly.

Similarly, if you keep thermos on the top-rack of your dishwasher and any mishap happens, it will come under warranty. If you put them on the bottom rack, it is doubtful to get warranty cover.

Besides, glassware thermos generally does not get a warranty cover if it gets broken in the dishwasher.

Which Part Of The Thermos Is Dishwasher Safe?

The thermos lids have rubber and plastic materials that screw together. Therefore, the lid of all thermoses is entirely dishwasher safe. Here also you need to place them on the top rack of your dishwasher.

But, if you want to avoid the accumulation of mold, use your hands to clean them properly. Residual foods, liquids, and other particles can get into the trap of lid parts, rubber gasket, straws or container parts. Rubber gaskets are one of the primary spaces where molds can quickly accumulate.

Unless you peel off them with your hands, the dishwasher won’t be able to wash them away. Hand wash ensures to clean your products thoroughly. You can remove the gasket and scrub it nicely.

After that, keep it in a place to dry separately before you put them back together. Do it once in a week or two to avoid mold spores in the containers.

Alternative Way To Wash Thermos

To avoid damage to your thermos, take warm water and liquid soap or mild detergent to clean your thermos after use. If it has hard stains, fill the container with warm water and a teaspoon of soda bicarbonate. Lastly, avoid the use of the stopper while the cleaning process is going on.

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