Check the product specifications or user manual to see if the item is dishwasher-safe before cleaning. Glass and plastic travel cups frequently offer this benefit, but stainless steel travel mugs do not. Don't worry if your mug can't go in the dishwasher. Cleaning is still relatively simple. Dish soap, a sponge, or a soft brush are all needed for a quick daily clean. On stainless steel mugs, stay away from steel wool brushes and abrasive household cleansers. Allow a mixture of vinegar and baking soda to sit inside the mug for a few minutes for a more thorough cleaning. Rinse and clean with dish soap before using.