How do I descale or clean the Ninja CE251?

Place the empty carafe under the brew basket, then fill the water reservoir with a descaling solution per package directions, or add 16 oz of white vinegar and fill the rest with water up to the 12-cup line. Press the CLEAN button to start the cycle, which takes approximately 25–35 minutes. When complete, the unit will beep; then run a full Classic Brew cycle with fresh water only to remove any remaining cleaning solution. (Page 11)