@sinituulia I drink different hot beverages during the day, so usually the mug goes into the dishwasher after having been used once, or at most twice, because I don't like to mix the tastes.They still remained tea-stained until somebody else in the house attacks them with the military-grade detergents, but I never bother with those :)(exceptions include:* in summer I often brew a liter or more of one herbal tea, that one of course gets poured in the same mug until it finishes;* in the morning I tend to have a plain black tea and a herbal tea some time afterwards: often the herbal tea is done in the same mug as the black tea, because I don't mind that specific taste combination.)