This is according to my Mr. Coffee instruction booklet:

1) Pour 1 quart of undiluted white household vinegar into your coffeemaker.
2) Put a paper filter into the brew tunnel. Slide the brew tunnel back into
place and place the empty decanter on the warming plate.
CAUTION: The special PAUSE 'n SERVE decanter lid must be on the decanter at all times. This lid controls the flow of liquids into the decanter. If it is not in place, the cleaning solution will overflow in the brew tunnel onto the warming plate.
3. Turn the coffeemaker on. Watch the cup markings as the vinegar flows into
the decanter. When three cups have flowed through, turn the coffeemaker
off, and let stand for 1/2 hour.
4. After 1/2 hour, pour the 3 cups of vinegar back into the coffeemaker.
5. Place the empty decanter on the warming plate. Turn the coffemaker on
and let all of the vinegar flow through.
6. Turn the coffeemaker off and discard the vinegar and the paper filter.
7. To flush out all traces of vinegar, fill the decanter with tap water and
pour into the coffeemaker. Turn the coffeemaker on and allow the water
to cycle through.
8. Turn the coffeemaker off. Discard the water and repeat step 7.

DECANTER CLEANING

1. Use a hot white vinegar solution and let it soak.
2. Let it stand for about 20 minutes and then discard.
3. Wash and rinse the decanter thoroughly using a soft cloth. Do not use
harsh abrasive cleaners. These will cause scratches which lead to
breakage.

HOPE THIS HELPS!!