Check the product’s directions or details to see if it can be washed in the dishwasher. This benefit is available in glass and plastic travel mugs, but not in stainless steel. Don’t be concerned if your cup isn’t dishwasher safe. Cleaning up is a breeze. Dish soap, a sponge, or a soft brush are used for daily cleaning. On stainless steel cups, stay away from steel wool and harsh cleaners. Soak the mug in vinegar and baking soda for a thorough cleaning, then rinse and clean with dish soap.