Why can’t you dish wash a Starbucks metal cup?
Technically, stainless steel is dishwasher safe, but Starbucks’ designs often have special coatings or insulation that can be damaged by heat and harsh detergents. Stainless steel is usually fine to go in the dishwasher on the top rack (where it’s coolest) but we recommend not putting coloured bottles in the dishwasher as they may lose their lustre.