How to Clean an Espresso Machine: Daily, Weekly and Monthly
Clean an espresso machine in three layers. After every use, purge and wipe the steam wand, flush the group head and rinse the portafilter. Once a week, backflush with espresso detergent and soak the baskets. Every one to three months, descale according to your water hardness and your manual.
Key takeaways
- Coffee oils and mineral scale are separate problems. Detergent removes oils; descaler removes scale.
- The steam wand needs attention every single time. Dried milk blocks the tip and is unhygienic.
- Only backflush machines with a three-way solenoid valve. Check your manual first.
- Use espresso machine detergent, not dish soap.
How to clean an espresso machine: the short version
You will need: espresso machine detergent or cleaning tablets, blind (backflush) basket or cleaning disc, group head brush, microfiber cloths.
- Purge and wipe the steam wandRight after steaming, wipe the wand with a damp cloth and open the steam valve for two seconds to clear milk from inside.
- Flush the group headRemove the portafilter and run water through the group head for a few seconds to rinse away loose grounds.
- Rinse the portafilter and basketKnock out the puck, rinse the basket and portafilter under hot water and wipe them dry.
- Backflush with detergent weeklyFit the blind basket, add detergent, lock in and run the pump for ten seconds, stop for ten, and repeat five times. Then repeat with plain water.
- Soak the metal partsSoak baskets and the metal end of the portafilter in hot water with detergent for 15 minutes, then rinse well.
- Descale on scheduleEvery one to three months, descale following your manual, then flush with two full tanks of fresh water.
An espresso machine gets dirty in two different ways, and they need different treatments. Knowing which is which makes the whole routine make sense.
Coffee oils coat everything the coffee touches: the basket, the portafilter, the shower screen and the valve behind it. They go rancid within days and make shots taste bitter and stale.
Mineral scale builds up wherever water is heated. It has nothing to do with coffee. It comes from your tap water, and it narrows pipes and insulates heating elements.
Detergent deals with oils. Descaler deals with scale. Neither does the other’s job.
After every use (one minute)
These three habits prevent most problems.
Steam wand
Wipe it with a damp cloth the moment you finish steaming, then open the steam valve for a couple of seconds. Milk dries hard within a minute, and milk drawn back into the wand goes sour inside it.
If the tip does block, soak it in hot water and clear the holes with a pin or the tool supplied with the machine.
Group head
Take the portafilter out and run water for two or three seconds. This rinses loose grounds off the shower screen. Wipe around the gasket with a cloth or a group head brush.
Portafilter and basket
Knock out the puck, rinse under hot water and wipe dry. Do not leave a used puck sitting in the machine. It dries onto the screen and feeds mold.
Empty the drip tray at the end of the day. It fills faster than you expect.
Once a week (ten minutes)
Backflush with detergent
Backflushing forces cleaning solution backward through the group head and the three-way valve, which is where old coffee oils collect.
Check first that your machine can be backflushed. It needs a three-way solenoid valve. Most machines from Gaggia, Rancilio and other prosumer brands have one, and Breville machines have a built-in cleaning cycle that does the same job using a tablet and a rubber disc. Many basic machines do not have the valve, and backflushing them can cause damage. Your manual will say.
For a machine that supports it:
- Replace the normal basket with a blind basket, which has no holes.
- Add the amount of espresso detergent shown on the packet, usually about half a teaspoon.
- Lock the portafilter in and run the pump for 10 seconds. Stop for 10 seconds. You will hear the solution discharge into the drip tray.
- Repeat five times.
- Remove the portafilter, rinse it, and repeat the whole cycle with plain water until the discharge runs clear.
- Pull one shot and throw it away to season the group.
Soak the metal parts
Dissolve a teaspoon of detergent in a bowl of hot water. Soak the baskets and the metal end of the portafilter for 15 minutes, then rinse thoroughly. Keep plastic or wooden handles out of the water.
If your shower screen comes off with a single screw, remove it once a month and scrub both sides. The amount of residue behind it tends to surprise people.
Every one to three months
Descale
Scale is removed with an acid-based descaler run through the water path. How often depends on your water: monthly with hard tap water, a few times a year with soft or filtered water.
Not every machine should be descaled at home. Many heat exchanger and dual boiler machines are better protected with softened water instead. The full method, and how to tell which applies to you, is in how to descale an espresso machine.
Water filter
If your tank has a filter or softening cartridge, replace it on the schedule in the manual, commonly every two to three months.
Once a year
Check the group head gasket, the rubber ring the portafilter seals against. If water leaks around the portafilter during a shot, or the handle turns further than it used to before it feels tight, the gasket has hardened and needs replacing. It is an inexpensive part and usually a ten-minute job.
Cleaning schedule at a glance
| When | What |
|---|---|
| Every use | Wipe and purge steam wand, flush group head, rinse portafilter |
| Daily | Empty drip tray, wipe exterior |
| Weekly | Backflush with detergent, soak baskets and portafilter |
| Monthly | Remove and scrub shower screen, wash water tank |
| Every 1 to 3 months | Descale, replace water filter |
| Yearly | Inspect or replace group head gasket |
Do not forget the grinder
Old grounds and oils inside a grinder go stale and flavor every shot. Brush out the chute weekly and clean the burrs every month or two. For machines with a built-in grinder this matters just as much.
Why it is worth the effort
A clean machine makes noticeably better coffee. Rancid oil is one of the most common reasons home espresso tastes bitter even when the grind and dose are right. If you have been adjusting your grind size without success, clean the machine before changing anything else.
For the brush and cleaners themselves, see our espresso machine cleaning kit.
Frequently asked questions
How often should I clean my espresso machine?
Some cleaning happens every time: the steam wand, a quick group head flush and a rinse of the portafilter. Backflush with detergent about once a week if you use the machine daily. Descale every one to three months depending on water hardness.
Can I use dish soap to clean an espresso machine?
Use it only for washing removable parts such as the drip tray and water tank. Do not backflush with dish soap. It foams, is hard to rinse out of the internal valves, and can leave a taste.
Can I use vinegar to clean my espresso machine?
It is not recommended. Vinegar is a weak descaler, leaves a lingering smell, and most manufacturers advise against it. Use a descaler made for espresso machines or a citric acid solution.
What happens if I never clean my espresso machine?
Coffee oils turn rancid and make every shot taste bitter. The shower screen and valves clog, water flow becomes uneven, and scale builds up inside the boiler until the machine heats poorly or stops working.