How to Clean a Coffee Machine Step-by-Step (Complete 2026 Guide)
š March 2026ā±ļø 14 min readāļø Di Pacci Coffee Company
A clean coffee machine is the single most important factor in great-tasting espresso ā even more than your beans or grinder settings. Coffee oils go rancid within hours, mineral scale chokes boilers and pipes, and trapped grounds breed bacteria. Yet most machine owners clean far less often than they should, then wonder why their coffee tastes bitter or their equipment fails early.
This comprehensive guide covers how to clean a coffee machine properly ā from the 30-second daily flush all the way through to full descaling and deep cleaning your espresso machine group head. Whether you own a home Breville, a Lelit dual-boiler, or a commercial La Marzocco, these techniques will keep your machine performing perfectly for years.
How to Clean Your Coffee Machine | Di Pacci Australia
Why Cleaning Your Coffee Machine Is So Important
Coffee residue accumulates in three distinct ways, each causing different problems:
Coffee oils: Natural oils from roasted beans coat every surface they touch. Within hours they turn rancid, producing the bitter, stale taste that ruins even the most expensive specialty coffee.
Mineral scale: Australian tap water contains dissolved calcium and magnesium. These minerals deposit inside boilers, heating elements, and pipes over time ā restricting flow, lowering brew temperature, and eventually cracking components.
Old grounds and residue: Trapped particles in shower screens, group gaskets, and portafilter baskets become breeding grounds for mould and bacteria.
The consequences of neglecting coffee machine maintenance include bitter flavour despite fresh beans, reduced water pressure, overheating, voided warranties, and significantly shortened machine lifespan. Research consistently shows that proper descaling alone can double the working life of an espresso machine.
ā ļø Warranty Alert Most Australian coffee machine warranties ā including brands stocked at Di Pacci ā require documented evidence of regular cleaning and descaling. Keep a simple maintenance log to protect your investment.
š” Hard Water Tip If you live in Perth, Adelaide, or regional Australia where water hardness exceeds 200 ppm, descale every 2ā3 weeks rather than monthly. Install a water filter or softener to protect your machine between descaling cycles.
Daily Coffee Machine Cleaning Routine
These three quick tasks prevent residue building up and ensure every cup starts fresh. They take under three minutes and should become as automatic as turning the machine off.
1
Flush the Group Head
After pulling your last shot of the day, remove the portafilter and run water through the group head for 10 seconds. This clears coffee oils and fine grounds from the shower screen and gasket before they have a chance to harden overnight.
2
Wipe & Purge the Steam Wand
Immediately after steaming milk, wipe the wand with a damp cloth to remove all milk residue, then purge steam for 2ā3 seconds to clear any milk drawn back inside the wand tip. Repeat wipe. Never let milk dry on the wand ā dried milk is almost impossible to remove without soaking.
3
Empty, Rinse, Wipe
Empty drip tray ā a full tray overflows and causes rust and mould underneath
Empty knock box to prevent mould growth
Rinse portafilter basket under hot running water
Wipe machine exterior with a damp microfibre cloth
How to Clean an Espresso Machine Group Head
The group head is the heart of your espresso machine and the area most affected by coffee oil buildup. A thorough weekly group head clean ā called backflushing ā is the single most effective espresso machine cleaning task you can do.
ā ļø Important Backflushing only works on pump-driven espresso machines with a 3-way solenoid valve (most machines priced above $500). Do NOT backflush steam-driven machines, Moka pots, or capsule machines ā check your manual if unsure.
Backflushing Step-by-Step
1
Prepare the Blind Basket
Insert a blind basket (solid disc with no holes) into your portafilter. Add half a teaspoon of espresso machine cleaning powder ā brands like Cafetto MFC or Puly Caff are ideal. Lock the portafilter into the group head and place a container underneath.
2
Run the Backflush Cycle
Start the brew cycle (pump on) ā run for 10 seconds
Stop the brew cycle ā the 3-way valve will force dirty water out through the drain
Wait 10 seconds
Repeat this on/off cycle 5ā7 times until the drain water runs clear
3
Rinse Cycle
Remove the portafilter, rinse the blind basket, then replace (no powder this time). Run 3ā5 more backflush cycles with plain water to flush all chemical residue. Finally, remove the portafilter and flush the group head freely for 20 seconds.
4
Scrub the Shower Screen
With portafilter removed, use a stiff group head brush to scrub the shower screen in circular motions while water runs through. For a monthly deep clean, remove the shower screen screw, soak the screen in cleaning solution for 15 minutes, scrub, and reinstall.
How to Clean the Steam Wand
Steam wand cleaning is the most neglected task in home espresso maintenance ā and one of the most important for both hygiene and milk texture. A blocked or dirty steam wand delivers uneven steam, produces flat microfoam, and harbours bacteria from dried milk proteins.
Daily Steam Wand Care
1
Wipe Immediately After Use
Keep a damp cloth beside your machine at all times. The moment you finish steaming, wipe the wand from base to tip with the cloth. This removes wet milk before it can dry. Then purge 2ā3 seconds of steam, and wipe once more.
2
Check the Tip
Look at the steam holes in the wand tip. If any are blocked, soak the tip in a small cup of hot water mixed with a teaspoon of Cafetto Milk Line Cleaner for 10ā15 minutes, then use a fine brush or pin to clear each hole.
Weekly Steam Wand Deep Clean
Once a week, submerge the steam wand tip in a jug of hot water with milk-line cleaner for 10ā15 minutes. This dissolves milk protein deposits that daily wiping can miss. Some machines allow you to remove the wand tip entirely ā if yours does, unscrew, soak, and scrub with a small brush before rinsing and reassembling.
š” Barista Tip Dedicate a separate steam wand cloth ā never the same cloth you use for wiping the group head or portafilter. This prevents cross-contamination of coffee oils onto the milk system.
How to Descale a Coffee Machine
Descaling removes the calcium and magnesium mineral deposits (limescale) that accumulate inside your machine's boiler, pipes, and heating element. This is the most important long-term coffee machine maintenance task ā scale buildup is the leading cause of espresso machine failure in Australia.
ā ļø Never Use Vinegar in an Espresso Machine Vinegar is too acidic and damages rubber seals, o-rings, and internal brass components. Always use a dedicated coffee machine descaler such as Cafetto Descaler, Dezcal, or Puly Milk. Citric acid solution is also safe and effective.
How to Descale ā Step-by-Step
1
Prepare Descaling Solution
Empty and rinse the water reservoir completely. Mix descaling solution according to manufacturer instructions (typically 1 sachet or 30ml per 1 litre of water). Fill reservoir with the solution. Place a large container (2 litres minimum) under the group head and steam wand to catch all liquid.
2
Run the Descaling Cycle
Machines with built-in descale program: Activate the descale mode and follow the prompts.
Manual descaling:
Dispense 100ml through the group head, then pause 5 minutes
Dispense 100ml through the steam wand, then pause 5 minutes
Continue alternating until the reservoir is empty
The pausing is essential ā it allows the descaler to dissolve scale between flushes
3
Rinse Thoroughly ā This Step is Critical
Empty and thoroughly rinse the water reservoir
Fill with fresh, cold water
Run the entire tank through the machine via group head and steam wand
Repeat with a second full tank of fresh water
Pull and discard 2ā3 test shots before making coffee you intend to drink
ā¹ļø How to Test Water Hardness Affordable water hardness test strips let you know exactly how aggressively scale is building in your machine. Under 100 ppm (soft): descale every 3 months. 100ā200 ppm (moderate): monthly. Over 200 ppm (hard): every 2ā3 weeks.
Essential Coffee Machine Cleaning Supplies
Using the right products makes cleaning more effective and prevents damage to seals and components. Here is everything you need for a complete coffee machine cleaning kit:
š§“
Cleaning Powder
Cafetto MFC or Puly Caff for backflushing and soaking baskets
š§
Descaler
Cafetto Descaler or Dezcal ā never vinegar
š„
Milk Line Cleaner
Cafetto Milk Line or Rinza for steam wands and auto-frothers
ā
Blind Basket
Solid backflush basket sized to fit your portafilter (54mm, 58mm)
šŖ„
Group Head Brush
Stiff nylon bristles for scrubbing shower screen and gasket
š§½
Microfibre Cloths
Lint-free cloths ā dedicate separate ones for group head and steam wand
š¬
Water Test Strips
Test your water hardness to calibrate your descaling frequency
š§
Water Filter
BWT or Bestmax filters reduce scale buildup between descaling cycles
Common Coffee Machine Cleaning Mistakes to Avoid
ā
Using Vinegar in an Espresso Machine
Vinegar corrodes rubber seals and internal brass fittings. Use only dedicated coffee machine descaler ā the cost difference is negligible and the damage risk is real.
ā
Skipping the Post-Descale Rinse
Descaler residue left in your machine taints the flavour of every shot and can damage components over time. Always flush at least two full reservoirs of fresh water after descaling.
ā
Letting Milk Dry on the Steam Wand
Dried milk protein is extremely difficult to remove and blocks steam holes. Clean the wand within seconds of finishing ā not after you drink your coffee.
ā
Backflushing Machines That Shouldn't Be
Only pump-driven machines with 3-way valves can be backflushed. Attempting to backflush a steam-driven or capsule machine can cause serious damage.
ā
Using Dish Soap on Coffee Equipment
Dish soap leaves a surfactant residue that ruins espresso flavour and destroys crema. Use only hot water or purpose-made coffee equipment cleaners on any component that contacts coffee or water.
ā
Forgetting the Grinder
Rancid coffee oils in your grinder contaminate every shot. Brush the grinder chute weekly and run a grinder cleaning tablet through monthly.
Everything in one box: cleaning powder, descaler, milk-line cleaner, blind basket, and group head brush. Perfect for setting up a full maintenance routine.
For daily use, flush the group head and wipe the steam wand after every session (2ā3 minutes). Backflush with cleaning powder weekly (15 minutes). Descale monthly, or every 2ā3 weeks if you have hard water. This schedule applies to both home and commercial espresso machines.
Can I use vinegar to descale my espresso machine?
No. Vinegar is too acidic for espresso machines and will damage rubber seals, o-rings, and internal brass components. Always use a dedicated coffee machine descaler ā products like Cafetto Descaler or Dezcal are inexpensive, highly effective, and safe for all machine types.
What is backflushing and does my machine support it?
Backflushing is a cleaning method that reverses water flow through the group head to flush out coffee oils from the 3-way solenoid valve and internal passages. It only works on pump-driven espresso machines with a 3-way valve ā most machines priced above $500. Check your manual to confirm. Never backflush capsule machines, Moka pots, or steam-driven machines.
Why does my coffee taste bitter even with fresh beans?
Bitter taste from fresh beans almost always indicates rancid coffee oil buildup in the group head, shower screen, or portafilter basket. Do a full backflush cycle with cleaning powder, soak your baskets in cleaner for 20 minutes, and scrub the shower screen. You should notice the difference in the very next shot.
How do I know when my machine needs descaling?
Warning signs include slow water flow through the group head, lower-than-normal brew temperature, or louder pump noise. However, don't wait for these symptoms ā by the time flow restricts noticeably, significant scale has already built up. Stick to a monthly descaling schedule to prevent problems before they occur.
How do I clean the steam wand properly?
Wipe the steam wand immediately after every use with a damp cloth, then purge 2ā3 seconds of steam to clear the inside. Weekly, soak the wand tip in a small cup of hot water with milk-line cleaner for 10ā15 minutes. If steam holes are blocked, use a fine pin or brush to clear each hole after soaking. Never let milk dry on the wand.
How long does a coffee machine last with proper maintenance?
Cleaning your coffee machine is not complicated ā but it does require consistency. The machines that last a decade aren't the most expensive ones; they are the best-maintained ones. A daily 2-minute routine, a weekly 15-minute backflush, and a monthly descaling cycle is all it takes to protect your investment and ensure every cup of coffee tastes exactly as it should.
If you are unsure which cleaning products suit your specific machine model, or if you would like advice on upgrading to a machine that makes maintenance easier, contact the team at Di Pacci ā Australia's largest coffee machine specialist, with stores in Sydney, Melbourne, Perth, Port Macquarie, and Queensland.
