Other Great Tips!
Fill the water reservoir with half distilled white vinegar and half water. Then turn on the coffeemaker and run through a cycle. Let mixture sit in the carafe for about an hour. Run as many cycles through of just water until the vinegar smell is gone. Usually 2-3 cycles takes care of it.
You can perform a similar process with your Keurig. Just run through a cycle without a -cup.
This process should be done every 1-3 months are when you feel your coffee just doesn’t take like it should.