The owners manual with our "12 cup Barista aroma grande" recommends cleaning the unit with a cleaner / descaler that you can buy at Starbucks, or 6 cups of a 50-50 vinegar-water solution, or 6 cups of a 50-50 lemon juice (no pulp!)-water solution. You have to then run a whole pot full of water through to rinse the unit. My wife cleans it once or twice a year with the Starbucks cleaner, and the staining comes off the inside of the pot (you may have to do it more than once with a 6-year deposit). The coffee also tastes better afterwards - less heavy and oily, more crisp and flavorful.
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