Daily Cleaning Steps for Your Mr. Coffee Espresso Machine
Clean your Mr. Coffee espresso machine every time you use it. The group head—the part where the portafilter locks in—collects old coffee grounds and oils that will make your next shot taste bitter and stale. A quick rinse takes two minutes and prevents buildup that becomes hard to remove later.
Start by running water through the group head without the portafilter attached. Turn on the machine and let water flow for five to ten seconds, then turn it off. This flushes out loose grounds. Next, insert the portafilter and run water through it for another five seconds. Remove the portafilter and empty the basket, then wipe the inside of the basket with a dry cloth or paper towel to remove any remaining grounds.
Wipe the shower screen—the flat metal piece inside the group head where water sprays through—with a damp cloth. If you see a ring of dried coffee around it, use an old toothbrush to scrub gently. Dry everything with a clean cloth before your next shot.
Key Takeaways
- Run water through the group head and portafilter when ready after each use to prevent grounds and oils from hardening inside the machine.
- Soak the portafilter and basket in hot water with espresso machine cleaner once a week to dissolve built-up oils that water alone cannot remove.
- Backflush the group head weekly by inserting a blank basket (no grounds) and running water for two seconds, then stopping, then repeating five to six times.
- Descale your Mr. Coffee espresso machine every one to three months depending on your water hardness, using a commercial descaling solution designed for espresso machines.
- Never use vinegar or homemade cleaners on espresso machines, as they can damage internal seals and leave flavors that affect your coffee.
Weekly Deep Clean with Espresso Machine Cleaner
Once a week, soak the portafilter and baskets in a solution of hot water and espresso machine cleaner. Use a product made for espresso machines—common brands include Cafiza and Backflush. Mix the cleaner according to the package directions, usually one teaspoon per cup of hot water. Let the portafilter and baskets sit for ten to fifteen minutes.
While they soak, use an old toothbrush to scrub the shower screen and the walls of the group head. Dip the brush in the same cleaning solution. Pay attention to the edges where the shower screen meets the group head, as coffee oils collect there. Rinse everything thoroughly under running water—any cleaner left behind will taste soapy in your next shot.
After rinsing, dry the portafilter, baskets, and shower screen with a clean cloth. Run water through the group head for ten seconds to flush out any remaining cleaner. Your machine is now ready for the next week of use.
Backflushing to Clear the Group Head
Backflushing means running water backward through the group head to force out oils and fine grounds that regular rinsing misses. Do this once a week. You will need a blank basket—a portafilter basket with no holes in the bottom. Mr. Coffee espresso machines usually come with one, but if yours did not, you can order a replacement basket from the manufacturer or a kitchen supply site.
Insert the blank basket into the portafilter but do not add any grounds. Lock the portafilter into the group head. Turn on the machine and let water run for two seconds, then turn it off when ready. You should see water and a small amount of coffee spray out of the portafilter. Turn the machine back on for two seconds, then off again. Repeat this five to six times. On the final cycle, let water run for five seconds to rinse out any loosened material.
Backflushing is loud and messy—water will spray onto your counter. Place a towel or small tray under the portafilter to catch the spray. If your machine has a pressure relief valve (a small button on the side of the group head), press it before you start backflushing to release pressure safely.
Descaling to Remove Mineral Buildup
Hard water leaves mineral deposits inside your espresso machine that block water flow and make heating slower. Descale every one to three months, depending on how hard your water is. If you have very hard water (high mineral content), descale monthly. If your water is soft, every three months is enough.
Buy a commercial descaling solution made for espresso machines. Do not use vinegar or homemade cleaners—they can corrode internal parts and leave flavors in your machine. Fill the water tank with the descaling solution mixed according to the package directions. Run the solution through the group head into a cup for thirty seconds, then stop. Wait five minutes. Repeat this cycle—thirty seconds on, five minutes off—until the water tank is empty. This takes about thirty to forty minutes total.
After descaling, empty the tank and refill it with fresh water. Run water through the group head for one full minute to rinse out all descaling solution. Repeat this rinse cycle two more times with fresh water each time. If any descaling smell remains, run one more cycle. Your machine is now descaled and ready to use.
Cleaning the Water Tank and Shower Screen
The water tank can grow mold or algae if left sitting with stale water. Empty the tank after each use and rinse it under running water. Once a week, scrub the inside with a bottle brush or old toothbrush to remove any slime or discoloration. Dry it completely before refilling.
The shower screen is the flat metal piece with small holes that sits inside the group head. Coffee oils coat it over time and can block water flow unevenly, making your shots taste sour or bitter. Remove the shower screen by unscrewing it counterclockwise—most Mr. Coffee machines have a screen that twists out. Soak it in hot water with espresso machine cleaner for ten minutes, then scrub with an old toothbrush. Rinse thoroughly and dry before screwing it back in clockwise until snug. Do not overtighten or you may strip the threads.
What Not to Do When Cleaning
Never use vinegar, baking soda, or lemon juice to clean your espresso machine. These are acidic and can damage the internal seals and gaskets that keep water from leaking. They also leave flavors that will affect your coffee for weeks. Stick to products made for espresso machines.
Do not soak the entire machine or submerge any electrical parts. Water inside the heating element or pump will cause rust and electrical damage. Only soak removable parts like the portafilter, baskets, and shower screen.
Avoid using abrasive scrubbers like steel wool or scouring pads on the group head or shower screen. They scratch the metal and create rough spots where coffee oils stick. Use soft brushes, cloth, or plastic scrubbers instead. If you see rust forming on the group head, stop using the machine and contact Mr. Coffee customer service—rust inside the water path means water is leaking where it should not.
Replacing Gaskets and Seals
The gasket is a rubber ring that sits between the portafilter and the group head. It creates a watertight seal so water flows through the grounds instead of around them. Over time—usually after six months to a year of regular use—the gasket hardens and no longer seals properly. You will notice water leaking from the sides of the portafilter or shots pulling unevenly.
Replacing the gasket is straightforward. Remove the portafilter and look inside the group head. You will see a rubber ring sitting in a groove. Pry it out gently with a flathead screwdriver or a plastic spoon. Clean the groove with a damp cloth and let it dry. Insert the new gasket—available from Mr. Coffee or kitchen supply sites—by pressing it into the groove all the way around. It should sit flush with no gaps. Lock the portafilter in and run water through to check the seal.
Frequently Asked Questions
Can I put the portafilter and baskets in the dishwasher?
No. The dishwasher's heat and harsh detergent can damage the metal and loosen the basket from the portafilter handle. Hand wash with hot water and a soft brush instead. If you need to soak them, use hot water with espresso machine cleaner, not dishwasher detergent.
My machine is leaking water from the group head. What should I do?
The gasket has likely worn out or hardened. Replace it following the steps in the "Replacing Gaskets and Seals" section above. If you replace the gasket and water still leaks, the group head itself may be cracked, and you will need to contact Mr. Coffee for repair or replacement options.
How do I know if my water is hard?
Hard water leaves white or tan mineral deposits on faucets and inside kettles. If you see buildup on your kitchen fixtures, your water is hard and you should descale your espresso machine monthly. You can also buy an inexpensive water hardness test kit at a hardware store to measure the exact mineral content.
What if I forget to clean my machine for a week?
Run water through the group head and backflush with a blank basket as soon as you remember. Soak the portafilter and baskets in hot water with espresso machine cleaner for twenty minutes instead of ten to loosen stubborn buildup. Your next shot may taste slightly off, but a thorough cleaning will restore normal flavor.
Is it safe to use the machine while it is descaling?
No. Never drink coffee made with descaling solution in the machine. Always run the full descaling cycle, then rinse with fresh water three times before making espresso again. Descaling solution is not toxic in small amounts, but it tastes terrible and can upset your stomach.