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How to clean your Keurig coffee maker inside and out

Your coffeemaker is a crucial part of your kitchen, but do you ever wonder what kind of gunk could be hiding inside of it?
Written by Maria Diaz, Staff Writer on

If you're like me and have a Keurig machine at home, you've probably wondered after having made gallons of coffee what kind of crud may have accumulated inside your coffee maker. You can choose avoid the topic, but I can't guarantee that the coffee is dark due to the roast or as a result of all the potential grime in there, or you can learn just how to clean your Keurig.

Whether you use pods or reusable K Cups, a Keurig coffeemaker has many nooks and crannies where buildup and mold could hide, so it's important to keep it as clean as possible. Whatever runs through your Keurig may also end up in your body, after all. 

Here's how to clean your Keurig coffeemaker

Keurig coffee maker with cleaning supplies
Image: Maria Diaz / ZDNet

Materials needed:

Estimated time:

  • About one hour

Step 1: Wash all removable parts

Before and after of removable parts

The mug stand gets particularly dirty!

Image: Maria Diaz / ZDNet

A Keurig has several removable parts where old coffee grounds can hide. Wash all removable parts with dish soap in the sink, including the water reservoir, mug base, pod holder, and milk steamer, if your machine has one. 

Be very careful with the needles when removing the pod holder. If you want to clean the needles on the brewer, you can use a pin or a paper clip to dislodge any grounds that may be slowing down your machine. I also wipe down the exterior of the brewer at this point.

Step 2: Empty reservoir and fill half with water and half with vinegar

Add vinegar and water to water reservoir
Image: Maria Diaz / ZDNet

Empty your water reservoir and remove the filter. If your filter is over two months old, it's probably time to replace it with a new one after you finish cleaning your machine. Fill the water reservoir halfway with white vinegar, then top it with water up to the fill line. 

Step 3: Run cycles until reservoir is empty

Keurig running with water and vinegar
Image: Maria Diaz / ZDNet

Place a large mug on the stand and run your Keurig through multiple 8-ounce cycles without inserting a K-Cup, until the water reservoir is empty of the cleaning solution. All the old coffee grounds and mineral buildup inside of the brewer should start coming out into the mug. I found old grounds were still coming out of the Keurig even after the water reservoir was half empty, so it's important to finish the process.

Step 4: Let it soak in

Keurig not running, letting the vinegar soak

The machine can stay plugged in while the vinegar soaks

Image: Maria Diaz / ZDNet

Once you've run all of the vinegar and water mixture out of the reservoir and through the coffeemaker, let what remains of the cleaning solution soak in the inner parts for about 30 minutes, but no more than three hours. 

While the vinegar soaks inside of the Keurig, remove the water reservoir again and wash it well to get rid of any lingering white vinegar but don't dry the inside of it as you don't want lint to stick to the inside of it. 

Step 5: Run a few rinse cycles

Keurig running with just fresh water
Image: Maria Diaz / ZDNet

Reassemble your Keurig and fill the water reservoir with fresh water this time. Run a few cycles with just water to rinse all the white vinegar out from inside the coffee maker. Keurig recommends about 12 cycles of just water after descaling.

How often should you clean your Keurig coffeemaker?

How often you use your Keurig will help determine how often you should clean it. Keurig recommends washing your water reservoir weekly and descaling your machine every three to six months. 

Why are there lingering tastes from past brew cycles?

If you find that taste from past cups transfers into new brews, you may benefit from running rinse cycles in between cups. This is especially helpful if you brew different drinks like hot cocoa or tea. 

What are the signs that I need to clean my Keurig?

Watch for signs that your coffeemaker needs a deep clean:

  • Lingering tastes from past brews that won't go away with rinsing cycles
  • Granules in your brewed mug
  • Foul or mildewy smells
  • Slow water trickle
  • Mineral buildup on machine
  • Descale prompt is on
  • Machine takes too long to fill a cup or doesn't fill it all the way

What do I do if I have hard water?

If mineral buildup is an issue with your Keurig, you may consider using filtered water in your reservoir instead of water straight from the tap. Hard water can cause mineral buildup that can affect the taste of your coffee and performance of the machine. 

How can you clean the Keurig without vinegar?

While running the rinse cycles in this process will get rid of the white vinegar inside the brewer, Keurig offers a descaling solution to remove mineral buildup that is an odorless alternative to white vinegar. 


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