Empty the carafe and filter basket, then run water through the machine

The fastest clean is a rinse: empty any leftover coffee and grounds, fill the water reservoir with fresh water, place an empty carafe on the warming plate, and run a brew cycle with no filter or grounds in the basket. This flushes loose debris and old coffee oils from the brew basket and tube. Do this once a week if you brew daily.

For a deeper clean that removes mineral buildup and old coffee residue, you need to disassemble the removable parts and soak them. Mr. Coffee makers have very few parts that come apart—the carafe, the filter basket, and the brew basket (the cone-shaped piece that sits above the carafe)—so this takes about five minutes. The removable parts are the only pieces designed to handle water; the machine body itself must stay dry.

Key Takeaways

  • Run a water-only brew cycle weekly to flush out loose grounds and old coffee oils that dull the taste.
  • Soak the carafe, filter basket, and brew basket in hot soapy water for 15 minutes, then scrub with a bottle brush or soft cloth to remove dried coffee and mineral deposits.
  • Descale the machine itself once a month by running a brew cycle with white vinegar and water, then two cycles with plain water to rinse out the vinegar taste.
  • Never soak the main machine body or put it in the dishwasher—only the removable parts are water-safe.

Remove and wash the carafe, filter basket, and brew basket

Unplug the machine and let it cool for a few minutes. Lift off the carafe by gripping it at the handle and pulling straight down. Remove the filter basket (the flat plastic piece that holds your paper filter) by lifting it out of the top of the machine. The brew basket—the cone-shaped piece inside the machine where water drips through—usually stays in place, but some models let you lift it out too. Check your manual or try gently lifting it; if it comes free, remove it.

Fill your sink with hot water and a squirt of dish soap. Place the carafe, filter basket, and brew basket in the water and let them soak for 15 minutes. This softens dried coffee and mineral deposits. After soaking, use a bottle brush or soft cloth to scrub the inside of the carafe (a bottle brush reaches the bottom easily) and wipe down the filter basket and brew basket. Rinse all three pieces under running water until the water runs clear and you smell no soap.

Descale the machine with vinegar to remove mineral buildup

Hard water leaves mineral deposits inside the machine's tubes and heating element, which slows water flow and makes coffee taste flat. Descaling once a month keeps the machine running at full strength. Fill the water reservoir with a 1-to-1 mix of white vinegar and water—for example, 5 ounces of vinegar and 5 ounces of water if your reservoir holds 10 ounces. Place an empty carafe on the warming plate.

Plug in the machine and run a full brew cycle. The vinegar solution will drip through the brew basket and into the carafe. Once the cycle finishes, let the machine sit for 15 minutes so the vinegar can work on the deposits inside. Then run two more brew cycles using only fresh water—no vinegar—to rinse out any vinegar taste. Your coffee will taste noticeably better after descaling.

Clean the warming plate and exterior

The warming plate under the carafe can collect spilled coffee and mineral residue. Once the machine is unplugged and cool, wipe the plate with a damp cloth or paper towel. If dried coffee is stuck on, dampen the cloth with a little vinegar and let it sit on the spot for a minute, then wipe. Do not use abrasive scrubbers, which can scratch the plate.

Wipe the outside of the machine with a dry or slightly damp cloth. If the exterior is sticky from spilled coffee, use a cloth barely dampened with water. Never pour water over the machine body or submerge it—only the removable parts are meant to get wet. Pay special attention to the seams where the water reservoir meets the body, as coffee can seep into cracks there.

What not to do: Common mistakes that damage Mr. Coffee makers

Do not put the machine body in the dishwasher or soak it in water. The heating element and electrical connections are inside the plastic housing, and water will damage them. Only the carafe, filter basket, and brew basket are dishwasher-safe on the top rack of most models—check your manual to be sure.

Do not use vinegar stronger than 1-to-1 with water, and do not leave vinegar in the machine for more than 15 minutes. Vinegar is acidic and can corrode the heating element if left too long or used at full strength. Always rinse with plain water afterward. Do not use commercial descaling powders unless your manual specifically recommends them; vinegar works just as well and costs less.

How often to clean each part

Run a water-only brew cycle once a week to flush loose grounds and oils. Wash the carafe, filter basket, and brew basket by hand or dishwasher after every use or at least twice a week—dried coffee is harder to remove the longer it sits. Descale the machine itself once a month if you have hard water, or once every two months if your water is soft.

If you notice the brew cycle is slower than usual or the coffee tastes weak, descale right away; that is a sign minerals are building up inside. A machine that brews noticeably slower than when it was new almost always needs descaling before it needs any other repair.

Frequently Asked Questions

Can I use baking soda instead of vinegar to clean my Mr. Coffee maker?

Baking soda works well for scrubbing the carafe and filter basket by hand, but it does not descale the machine itself the way vinegar does. Vinegar dissolves mineral deposits inside the tubes and heating element. You can use baking soda as a paste to scrub stubborn stains on the carafe, then rinse well.

Why does my coffee taste bitter even after I clean the machine?

Bitter taste usually means old coffee oils are stuck inside the machine or the water is not hot enough. Run a vinegar descale cycle to remove buildup, then brew a pot of water-only to rinse. If the taste does not improve, the heating element may be failing and the machine may need replacement.

Is it safe to run vinegar through my Mr. Coffee maker?

Yes, a 1-to-1 vinegar-and-water mix is safe and is the standard way to descale these machines. Always follow with two plain-water brew cycles to rinse out the vinegar taste. Do not use vinegar stronger than 1-to-1 or leave it in the machine longer than 15 minutes.

What should I do if water is leaking from the bottom of my machine?

Check that the carafe is seated properly on the warming plate—a carafe that is not pushed all the way down will leak. If the carafe is in place and water still leaks, the brew basket seal may be worn out or the machine may have internal cracks. Cleaning will not fix this; the machine will likely need replacement.