Bodum's double-walled cups and glasses are all suppose to be dishwasher safe...this is not true. Even using only the upper rack for washing the product will allow dishwasher water to enter the vacuum chamber...thus, you'll have dirty water sloshing around inside the glass with no way to escape. Try and get some satisfaction from Bodum!! Repeated calls to their NYC center are deadheaded and there is ZERO customer care...this company is a real joke, only the joke is on you!! Give their products a wide berth.