Tumbler, can you just drink water without washing it? It could easily become a 'bacteria mess'.

 

Bacteria can multiply even just by drinking water

Tumbler can easily become a breeding ground for bacteria even when used with just water. The mouth contains various types of bacteria, and during the drinking process, the contents and saliva can mix, allowing bacteria to multiply. The same applies to parts that come into direct contact with the mouth. Moreover, since tumblers are often carried while drinking, bacteria on the hands can transfer to them. In fact, a study published in the Journal of Public Health found that streptococci and other bacteria were detected in unwashed water bottles.

Used tumblers should be cleaned immediately whenever possible. All parts of the tumbler, including the inside, outside, and the mouth area, must be properly maintained. However, simply rinsing with water is not sufficient; it must be scrubbed with a brush. According to the Langone Medical Center at New York University in the United States, reusable water bottles like tumblers can develop biofilms inside the bottle over time if not properly maintained. Therefore, it is important to thoroughly clean every corner, including the inside of the bottle and the area that contacts the mouth.

If using detergent feels burdensome, using baking soda can also be helpful. Baking soda is a mildly alkaline substance that effectively removes water stains by converting fats and other residues into water-soluble forms. Baking soda particles become soft when mixed with water, preventing scratches on the surface of the tumbler, making it effective for cleaning. After cleaning, ensure it is completely dried and stored to prevent bacterial growth.

Meanwhile, to use a tumbler hygienically, you should also pay attention to and properly manage the lid. The rubber gasket of the lid tends to stay wet with the liquid inside the tumbler. Because of this, mold can easily develop. If the rubber gasket is black, there are many cases where people overlook it and just use it as is. When cleaning a tumbler, it is good to remember to also clean the lid and soak it in lukewarm water mixed with baking soda. After letting it sit for about 10 minutes, scrubbing with a toothbrush will allow for a thorough cleaning.