How to Clean an Espresso Machine: When Not to Backflush
Rinse the basket and portafilter and wipe and purge the steam wand after every session. Once a week, brush the gasket and wipe the shower screen. Backflush with detergent only if your manual describes it, since it needs a three-way solenoid valve: Rancilio does it weekly on the Silvia, and Breville runs it as a cycle when the machine prompts. Descaling is a separate job for minerals.
Key takeaways
- Cleaning removes coffee oil with detergent; descaling removes minerals with a descaler. Breville's manuals treat them as separate cycles.
- The Breville Bambino's US manual has no detergent step, and its clean and descale alert runs a descale. The Bambino Plus runs a detergent flush after 200 extractions.
- On the Barista Express, a flashing Clean/Descale light asks for the back-flush and a solid light asks for a descale.
- Backflushing needs a three-way solenoid valve. If your manual describes no backflush, do not improvise one.
- Rancilio's weekly Silvia routine runs detergent 5 seconds on and 10 off, 8 to 10 times, then repeats with water only.
Cleaning an espresso machine is two jobs that share one word. Coffee oil and fine grounds build up in the basket, the shower screen and the group head, and a detergent removes them. Minerals build up inside the boiler, and a descaler removes those. Manufacturers do not even use the word the same way. Read your machine's own manual before you buy a tub of anything: the five manuals below describe five different routines, and one of them has no detergent step at all.
Two kinds of dirt, two different products
Coffee oil and grounds:
- collect in the basket, portafilter, shower screen and gasket
- turn rancid and taste stale in the cup
- come off with rinsing, a brush and, where the manual allows it, a detergent backflush
Minerals (scale):
- collect in the boiler, heating block and pipes
- slow the flow and drop the brewing temperature, Breville's manuals say
- come off only with a descaler, on a schedule your water hardness sets
Descaling has its own guide, how to descale a coffee maker or espresso machine, and the descaling schedule tool works out the interval for your water. This piece is about the oil side.
Rule of thumb: detergent removes coffee oil, descaler removes minerals, and Breville's manuals treat them as separate cycles.
What your manual actually says
We read the current US manuals for five machines in BrewSift's espresso catalogue. The same word, clean, covers three different procedures across them.
| Machine | Detergent step in the manual | When it asks | What the prompt means |
|---|---|---|---|
| Breville Bambino | None. No cleaning disc or tablets are listed in the box; a 2 Cup press runs a plain water rinse | 2 Cup button flashes | Called clean and descale, and the procedure is a descale |
| Breville Bambino Plus | Flushing cycle with the supplied cleaning disc and a cleaning tablet | After 200 extractions; 1 Cup and 2 Cup flash in turn | A flush, which Breville says is separate from descaling |
| Breville Barista Express | Back-flushing cycle with the 1 Cup basket, cleaning disc and one tablet, about 5 minutes | Clean/Descale light flashing | Flashing means back-flush; solid means descale |
| Gaggia Classic Pro E24 | Filters only: a daily warm-water wash, and Gaggia cleaning tablets for a deeper clean | Not stated | No group backflush described |
| Rancilio Silvia | Weekly backflush with detergent in a blind basket | Weekly | A routine you run yourself, no light |
The Bambino pair is the surprise
The two Bambinos share a name and very little of this routine. The Plus ships with a cleaning disc and tablets and counts shots until it asks for a flush. The plain Bambino's US manual lists neither, and the alert it calls clean and descale has you fill the tank to the descale line and run descaler through. On that machine, oil comes off with rinsing and wiping, not detergent.
Two flashing lights that mean different things
On the Barista Express one light carries both jobs. Flashing asks for the back-flush with a tablet; solid asks for a descale. Run the wrong one and you have cleaned the half of the machine that was not dirty.
Why some machines can backflush and others cannot
A backflush pushes water, with or without detergent, back up through the group head and out of the machine through a three-way solenoid valve. La Marzocco describes that valve's day job. When a shot ends, it diverts the water above the coffee into the drip tray and depressurises the group, which is why you can take the portafilter off straight away. Its field-test manager calls the valve one of the most important parts of the machine and says keeping it clean through regular backflushing keeps the flow consistent.
Kanen Coffee's backflush guide states the limit plainly: backflushing only works on machines with a three-way solenoid valve, and it warns never to backflush one without, because you can damage the pump or internal parts. Gaggia lists a three-way solenoid valve on its Classic Pro E24 product page, even though the E24's US manual stops at the filters.
Self-test: pull a shot, then lift the drip tray grate. If water spits from a small tube there as the shot ends, that is the three-way valve at work.
The weekly backflush, Rancilio's way
Rancilio publishes a weekly routine for the Silvia. It is the clearest manual backflush we found, and it shows the shape of the job on any machine that allows one.
The Silvia weekly backflush, step by step
- Remove the portafilter and purge the group for 3 to 4 seconds.
- Brush the portafilter gasket with the supplied brush.
- Fit the blind basket or disk and add coffee cleaning detergent. Rancilio says tablets or powder both work.
- Lock the portafilter in and lift off the cup-holder grid.
- Run the brew switch for 5 seconds, then off for 10. Repeat 8 to 10 times, until the water runs clear.
- Rinse the portafilter and blind disk, lock them back in and repeat the 5-on, 10-off cycle 8 to 10 times with water only.
- Soak the portafilter and basket in detergent solution for 15 minutes, then rinse and brush.
Cafiza tablets are a coffee-machine detergent sold for this job. Breville's automatic cycles call for the cleaning tablets supplied in the box, and its manuals do not name an alternative, so check with Breville before swapping in another brand.
Daily, weekly, or when the machine asks
A cleaning routine built from the five manuals
- After every session: rinse the basket and portafilter under hot water (Breville).
- After every milk drink: wipe the steam wand with a damp cloth and purge it (Breville).
- After every session: run water through the group with an empty basket, and empty the drip tray when its indicator rises (Breville Bambino).
- Weekly: wipe the shower screen and brush the gasket (Breville, Rancilio).
- Weekly: soak the steam wand in milk cleaning solution for 15 to 30 minutes, then purge it (Rancilio).
- Weekly, if your manual allows it: a detergent backflush (Rancilio).
- On the prompt: the detergent cycle or the descale, whichever your machine is asking for.
When the basket holes block
What the manuals suggest:
- the pin on Breville's cleaning tool, pushed through each hole
- a cleaning tablet dissolved in hot water, with the basket and portafilter soaked for about 20 minutes (Barista Express)
- the filters immersed in boiling water for 10 minutes, then rinsed (Gaggia)
What the manuals rule out:
- the dishwasher, for the portafilter or any part (Breville Bambino)
- washing-up liquid or a cleaning agent on Gaggia's pressurised filter holder, which Gaggia says can make it malfunction
- abrasive cleaners or pads on the housing (Breville)
If you have not bought a machine yet
Cleaning is part of the running cost. A machine that counts shots and runs its own flush, like the Bambino Plus or the Barista Express, takes the remembering off you. The Silvia hands you a weekly job, with a 15-minute soak at the end of it. The plain Bambino has the shortest routine of the five, because its manual has no detergent step at all. Super-automatics run their own brew-group and milk-system programs, which the table does not cover; see super-automatic vs semi-automatic for that trade. The full field is in espresso machines, the tools in espresso accessories, and the budget picks in the best espresso machine under $500.
Cleaning tablets, and machines that prompt you
Cafiza Espresso Machine Cleaning Tablets, 100 ct
The backflush tablet every café uses — 100 tablets is a year of weekly cleaning for about 18 cents a go.
Bambino Plus
The easiest path to genuinely good espresso and hands-free milk in a tiny footprint.
Barista Express
The classic all-in-one: built-in grinder, manual wand, everything you need to start in one box.
Classic Pro E24
A 58mm commercial-style machine that teaches real espresso and welcomes modifications.
BrewSift earns a commission on qualifying purchases made through these links, at no extra cost to you. Prices shown were checked on publication and change often.
FAQ
How often should you backflush an espresso machine?
Follow your manual. Rancilio publishes a weekly detergent backflush for the Silvia, Breville's Bambino Plus asks for its flushing cycle after 200 extractions, and the Barista Express flashes its Clean/Descale light when the back-flush is due.
Can you backflush a Breville Bambino?
Breville's US manual for the Bambino describes no backflush or detergent cycle and lists no cleaning disc or tablets in the box. Its clean and descale alert runs a descale. The Bambino Plus is different and has a flushing cycle with a disc and tablet.
Is cleaning an espresso machine the same as descaling it?
No. Cleaning removes coffee oil and grounds from the basket, shower screen and group with water, a brush or detergent. Descaling removes minerals from the boiler with a descaler. Breville's manuals describe them as separate cycles.
Can I put the portafilter in the dishwasher?
Breville says not to put the Bambino's portafilter, or any of its parts or accessories, in the dishwasher. Rinse it under hot water after use, and soak it in a dissolved cleaning tablet if the basket holes block.
How do I clean the steam wand?
Wipe it with a damp cloth and purge it after every milk drink, as Breville describes. Rancilio adds a weekly soak in milk cleaning solution for 15 to 30 minutes, followed by a rinse and another purge.
Sources
- Breville — Bambino BES450 US instruction book (accessories, clean and descale cycle, group head rinse, care and cleaning)
- Breville — Bambino Plus BES500 US instruction book (cleaning cycle after 200 extractions, cleaning disc and tablet)
- Breville — Barista Express BES870 US instruction book (back-flushing cycle, flashing vs solid Clean/Descale light, basket soak)
- Gaggia — Classic Pro E24 US user manual (cleaning the filters, Gaggia cleaning tablets, pressurised filter holder warning)
- Gaggia North America — Classic Pro E24 product page (page description lists a 3 way solenoid valve)
- Rancilio Group North America — Rancilio Silvia weekly cleaning (backflush and steam wand steps)
- La Marzocco USA — The 3-way solenoid valve (what it does and why backflushing keeps it clean)
- Kanen Coffee — Backflush guide (three-way solenoid requirement, warning for machines without one)