What maintenance should I perform regularly on my coffee maker?

Periodically hand-wash the water reservoir, lid, and drip tray with warm soapy water and rinse clean. Clean the water reservoir by wiping the inside with a damp, non-abrasive, lint-free cloth and allowing it to dry completely. Replace Keurig® Water Filters every 2 months, and descale every 3 months or when the Descale notification turns on. (Page 4)

From the official Keurig K-Express Essentials Coffee Maker manual, page 4

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