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Coffee is oily. Those oils coat the shower screen, the group head, the portafilter and the basket, and within days they oxidize and turn rancid. From then on every shot passes through them. It tastes stale and slightly bitter, and it is not something you can grind or dose your way out of.
This is a different job from descaling, which removes mineral scale from inside the machine. Different problem, different product, different schedule.
Quick picks — How to clean an espresso machine
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Pick
Best for
Type
Price
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Urnex Cafiza Espresso Machine Cleaning TabletsTop pickThe standard espresso-machine detergent tablet. It removes coffee oil residue, which is a different job from descaling.
Urnex Rinza Milk Frother CleanerAn alkaline cleaner for milk residue. Necessary for automatic milk systems, useful for a manual wand you have not been perfect with.
A steam wand or milk system that has had milk in it
We have not handled these units. Everything above comes from published manufacturer documentation, cited inline, plus arithmetic you can redo yourself. Everyone in this category says they tested twenty machines; we have not tested any, and we say so. Here is what we do instead.
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Urnex Cafiza Espresso Machine Cleaning Tablets
Backflushing coffee oils out of the group
The standard espresso-machine detergent tablet. It removes coffee oil residue, which is a different job from descaling.
We have not compiled a cited spec sheet for this pick yet, so there is no spec table here. What follows is about fit — who it is for and who it is not — not about numbers we cannot source. See how we pick.
Cleaning and descaling are two different tasks with two different products. Cleaner removes coffee oils from the group head and baskets; descaler removes mineral scale from the boiler.
Using descaler where cleaner is needed leaves the oils, and the shots keep tasting stale and bitter no matter how new the beans are.
What it does well
Does the job the machine manual asks for
Tablets are pre-dosed, so there is nothing to measure
What you give up
Only backflushable machines can use the full procedure
Not a descaler — you need both
Skip it only if your machine's manual specifically forbids backflushing — some entry machines do. Wipe and soak instead.
A steam wand or milk system that has had milk in it
An alkaline cleaner for milk residue. Necessary for automatic milk systems, useful for a manual wand you have not been perfect with.
We have not compiled a cited spec sheet for this pick yet, so there is no spec table here. What follows is about fit — who it is for and who it is not — not about numbers we cannot source. See how we pick.
Milk protein bakes onto a hot wand within seconds. Purging and wiping the wand immediately after every use prevents almost all of it, for free.
Where a cleaner earns its place is automatic milk systems with tubes you cannot reach with a cloth.
What it does well
Reaches the parts of a milk system a cloth cannot
Cheap per use
What you give up
Unnecessary if you wipe and purge a manual wand every time
Skip it if you have a manual wand and you already purge and wipe it after every drink. That habit does the same job for nothing.
**Knock the puck out and rinse the basket** under the tap. Wet grounds in a warm basket go rancid fast.
**Wipe the shower screen** with a damp cloth, portafilter removed.
**Run a two-second flush** through the group head to clear loose grounds.
**Purge and wipe the steam wand** immediately after milk — see steam wand care.
Every week to month
A proper clean with an espresso machine detergent. How you do it depends on whether your machine can backflush.
**If it can backflush** (it has a three-way solenoid valve — check the manual), use a blind basket and a cleaning tablet. Full method on backflushing.
**If it cannot** — which includes most entry-level machines — soak instead. Dissolve a tablet in hot water and soak the portafilter, both baskets and the shower screen if it is removable, for around twenty minutes. Scrub with a soft brush, rinse very thoroughly, and run a tank of clean water through.
What to clean, how, how often
Part
How
How often
Basket
Rinse; soak in detergent
Every shot; weekly
Portafilter body
Wipe; soak (keep the handle out of the water)
Daily; weekly
Shower screen
Wipe; brush; remove and soak if it comes off
Daily; monthly
Group head seal area
Brush around the gasket edge
Weekly
Steam wand
Purge and wipe hot; soak the tip
Every use; weekly
Drip tray
Wash
Weekly, or when it smells
Water tank
Rinse and dry, no detergent
Weekly
Grinder chute and burrs
Brush; take burrs out if the design allows
Weekly; monthly
The parts everyone forgets
**The underside of the shower screen.** It is the surface with the most coffee oil on it and the one you never see. Remove it if the design allows.
**The group gasket edge.** Old grounds pack in around it, which eventually causes leaks around the portafilter.
**The drip tray drain hole.** Blocks quietly, then overflows.
**The grinder.** Coffee oils go rancid in a grinder just as readily. Brush the chute weekly and remove the burrs monthly if the design allows.
What clean tastes like
If your shots have been getting progressively duller and slightly bitter over a few weeks and the beans have not changed, clean the machine before you touch the grinder. It is the fastest thing to rule out and it is the answer more often than people expect.
Questions people actually ask
How often should I clean my espresso machine?+−
Rinse the basket and wipe the shower screen daily, and do a proper detergent clean weekly to monthly depending on how much you use it. That is separate from descaling, which happens every one to three months.
Can I use dish soap to clean espresso equipment?+−
Better not to. It leaves a residue that affects both taste and how the coffee behaves in the basket. Espresso machine detergent rinses clean; hot water and a soft brush are the next best thing.
What are espresso machine cleaning tablets for?+−
They dissolve coffee oils from the group head, portafilter and baskets. They are a detergent, not a descaler — they do nothing about mineral scale.
How do I clean the shower screen?+−
Wipe it daily with the portafilter removed, brush it weekly, and if it unscrews, remove it monthly and soak it in detergent. The underside collects the most oil and is the surface you never see.
