You can easily remove coffee oils and hard water deposits, using a solution consisting of white vinegar and cold water.
- Mix two parts water to one part white vinegar. Mix a full pot of this vinegar and water solution and pour it into the reservoir of your coffee maker.
- Turn on your coffe maker
- let the vinegar-water mixture cycle through. After the solution has completely run through, turn off the coffee maker and allow the pot to cool
- Pour the solution down the drain, rinse and clean the pot.
- Pour water into the reservoir of your coffee maker and cycle through the coffee maker. This will rinse the vinegar-water solution out of the coffee maker.
It may work for you too. But ofcourse check for the producer comments and user manual of your coffee maker.