To clean a coffee machine inside, rinse the brew path after every session, flush the milk system after every milk drink, clean the brew unit or group head weekly, run the machine’s cleaning cycle monthly, and descale when the machine asks. Skip these and old coffee oil goes rancid on the brew surfaces, milk sets hard in the frother, and scale narrows the water circuit. The coffee turns bitter first, and the repairs follow.
The schedule below works for bean-to-cup machines from DeLonghi, Jura, Philips, Saeco and Siemens, and for manual espresso machines like the Breville Barista Express and DeLonghi Dedica.
What builds up inside a coffee machine nobody cleans?
Coffee oil, milk residue and limescale build up, each in a different part of the machine.
| Build-up | Where it collects | What it does |
|---|---|---|
| Coffee oil | Brew unit, group head, shower screen, spout | Turns rancid within days and makes every cup bitter |
| Milk residue | Milk tubes, carafe lid, frother, steam wand tip | Sets hard, blocks the frother and grows bacteria |
| Limescale | Heater, pump, valves, pipes | Slows heating, cuts pressure and blocks valves |
The water tank and drip tray add a fourth problem. Stagnant water with coffee residue grows slime and mould within a week in a warm kitchen.
What should you clean every day?
- Empty the drip tray and grounds container, and rinse both.
- Flush the milk system straight after the last milk drink. Use the clean setting on a carafe machine, or purge and wipe the steam wand on a manual machine.
- On a manual espresso machine, knock out the puck, rinse the basket and run water through the group head for two to three seconds.
- Empty the water tank at night and refill it with fresh cold water in the morning.
What should you clean every week?
- Bean-to-cup machines with a removable brew unit, such as DeLonghi, Philips, Saeco and Siemens: take out the brew unit, rinse it under lukewarm running water, brush off the old coffee and let it dry. Use water only, because detergent damages most brew units. Philips and Saeco units also need their grease renewed, as the manual sets out. Jura brew units stay inside and are cleaned by the cleaning cycle.
- Manual espresso machines: brush the group head and shower screen, and soak the baskets in espresso machine cleaner.
- Wash the milk carafe lid and its small seals in hot soapy water.
- Wash the water tank and drip tray in warm soapy water and rinse them well.
- Pull off the coffee spout and rinse it.
What should you clean every month?
- Run the machine’s cleaning cycle with the manufacturer’s cleaning tablet. On a manual machine, this is a backflush with the blind disc or basket.
- Run milk system cleaner through the frother.
- Vacuum the bean hopper and brush the grinder chute dry.
- Descale when the machine asks, using a descaler made for coffee machines. Keep vinegar out, because it hardens rubber seals.
How does dirt inside the machine turn into a repair?
Old coffee oil hardens the brew unit seals and the group head gasket, and they start leaking. Packed grounds jam the brew unit and stop it moving. Dried milk blocks the frother. Scale narrows the water path, so the pump works harder and wears out, and the heater runs hot until a sensor fails. Each of these starts as a cleaning problem and ends as a part on our bench.
| Neglected for | What we usually find | Typical job |
|---|---|---|
| A few weeks | Oil film on the brew surfaces, a bitter edge in the cup | A home clean fixes it |
| Several months | Hard oil on the brew unit, scale in the heater, slime in the tank | Deep descale and flush, R650 to R1,100 |
| A year or more | Hardened seals, leaks, a stiff brew unit, a blocked frother | Full service, R950 to R1,800, plus any worn parts |
Which cleaning jobs belong to a technician?
A home clean reaches the parts you remove. The inside of the heater, the valves and the pipes need the machine opened. A workshop service strips the machine, descales the circuit internally, replaces hardened seals, and tests it with real coffee. Once a year suits a home machine used every day, and every six months suits an office machine.
Where do you go from here?
The schedule above covers every machine. Each topic below goes deeper on one part of it.
- Scale is the slowest and most expensive build-up. Our guide to hard water damage in coffee machines explains how to stop it.
- Bitter coffee is usually the first sign of a dirty machine. Our guide to coffee tasting burnt or bitter separates cleaning causes from faults.
- The steam wand needs its own habit. See why and how to purge a steam wand.
- Coffee residue and warmth attract insects. Our article on cockroaches in coffee machines shows the damage they do.
- Brand schedules: the DeLonghi maintenance schedule and the Breville Barista Express cleaning guide.
- When cleaning stops being enough, read how often a coffee machine needs servicing.
Cleaning questions we get
How often should you deep clean a coffee machine?
Run the cleaning cycle and the milk cleaner once a month, and descale when the machine asks. A busy office machine needs the cleaning cycle every week.
Is vinegar safe for descaling a coffee machine?
No. Vinegar hardens rubber seals. Our guide to hard water and limescale covers safe descaling.
Why does my coffee machine smell bad?
A sour or musty smell comes from stagnant water in the tank or drip tray, or old milk in the frother. Wash both, flush the milk system, and run the cleaning cycle. If the smell stays, the machine needs a workshop clean.
Book a workshop clean and service. Book online, call 010 065 1995, or WhatsApp the brand and model to 073 375 6375. See our coffee machine services for what a service includes.
