We recommend to wash the new Kupilka-products before using. The products are dishwasher safe, and we recommend to use fragrance free detergents when washing these dishes.The Kupilka-products are still not affected if you would wash them only after arriving home after the adventure. Kupilka-dishes do not absorb any smells or tastes of the food or drinks.There are companies that have used Kupilkas for years and washed them countless times with professional dishwasher without Kupilkas to lose they quality. Based on that experience we can say Kupilkas can be washed with a commercial dishwasher.