Yes, you can wash your vessel in the dishwasher, but in the top rack only as the heating elements used to heat the water and air dry the dishes are usually located beneath the bottom rack, which may cause nearby plastics to melt. Because of the unique shape of KOR products, we highly recommend hand washing with hot water, a small drop of dish soap and a bottle brush. Tritan (the transparent plastic that the vessel body is made of on all bottles styles except Vida) has been shown in tests to withstand 500 washings with no visible degradation. That means if you wash your vessel once a week, it should last 10 years or more (compare that to polycarbonate, the most common type of clear hard plastic used in water bottles, which started to degrade after only 30 washings in our tests). Allowing your vessel to air dry completely with the cap open will help to avoid unwanted moisture build up in your KOR and around the seals.
Keeping your vessel clean is important, especially if you are using it for any other liquid besides plain water. Daily washing of your bottle is necessary when you are using additive powders, liquids, vitamins, and non-water liquids, as these types of contents can smell or cause mold if residue is left in your vessel. Since our mouths naturally harbor bacteria, it is highly recommended that you do wash your vessel daily even when carrying just water.