Once a month, fill the water reservoir with a mixture that's half distilled white vinegar and half water. Turn on the coffeemaker. Let several cups run through, then turn it off and let sit for an hour. Start the machine again to complete the cycle, discarding the vinegar mixture afterward. Run plain water through the coffeemaker a few times until the vinegar odor disappears. To clean the carafe and filter basket, place in the top rack of the dishwasher.