How to Clean and Descale Your Coffee Machine

It's easy to focus entirely on beans, grind and brewing method while forgetting the one thing that touches every single cup: your machine. A dirty or scaled-up coffee maker can quietly ruin good coffee no matter how carefully you've chosen everything else. Here's what to clean, how often, and why it matters.

The quick answer

Regular cleaning removes coffee oil residue and buildup that can turn rancid and add bitterness, while descaling removes mineral deposits (limescale) left behind by water, which can affect both flavour and your machine's performance over time. As a general rule, rinse and wipe removable parts after every use, do a deeper clean weekly, and descale every 1-3 months depending on your water hardness and how often you brew.

Why Coffee Oil Buildup Matters

Coffee naturally contains oils, and over time these build up on brew baskets, portafilters, carafes and internal components. Left unchecked, these oils can turn rancid and add a stale, bitter edge to every cup brewed afterward — even if you're using fresh, high-quality coffee. This is one of the most common reasons a previously good machine starts producing disappointing coffee.

Why Limescale Buildup Matters

Most tap water contains dissolved minerals, particularly calcium and magnesium, which build up as limescale inside heating elements, pipes and valves as water passes through repeatedly. Beyond affecting flavour, significant limescale buildup can reduce heating efficiency, restrict water flow, and eventually damage internal components — descaling isn't just about taste, it protects your machine's lifespan.

Daily and Weekly Cleaning

After each use, rinse and dry any removable parts that contact coffee directly — baskets, filters, portafilters and carafes — and wipe down the machine's exterior. Once a week, give these parts a more thorough wash with warm soapy water (or run them through a dishwasher if they're dishwasher-safe), and check for any visible coffee oil residue in less obvious spots like group heads or spouts.

How Often to Descale

Descaling frequency depends heavily on your local water hardness — homes in hard water areas may need to descale monthly, while soft water areas might only need it every 2-3 months. Most machines will show warning signs of scale buildup (slower brewing, reduced steam pressure, unusual noises) before it becomes a serious problem, but it's better to descale on a regular schedule than wait for symptoms.

How to Descale (General Process)

Most machines follow a similar process: run a descaling solution (or a food-safe alternative like diluted citric acid) through the machine as if brewing, following your specific machine's recommended concentration and cycle count, then run several cycles of plain water afterward to fully rinse out any residue. Always check your machine's manual first, since some models have a dedicated descaling mode or specific solution requirements.

Using Filtered or Softened Water

As covered in our water quality guide, using filtered water can significantly reduce both mineral buildup and unwanted flavours from tap water, meaning less frequent descaling and better-tasting coffee overall.

Common Misunderstandings

A common myth is that descaling is only necessary once symptoms appear — by the time you notice slower brewing or reduced pressure, scale buildup is often already fairly advanced, so a regular preventative schedule is a better approach. Another myth is that any acidic liquid works fine for descaling — always use a product designed or explicitly approved for your specific machine, since some acids can damage certain seals or components.

Why Choose Amici Coffee?

Amici Coffee is an independent UK coffee business with six carefully selected coffees, each with clear origin and tasting information rather than vague blend descriptions. Beans are roasted in partnership with a certified B Corp speciality coffee roasting partner that holds the highest B Corp score of any coffee roaster we work with — a genuinely world-leading, global leader in ethical coffee roasting. You can order online for delivery, visit our café in person, or set up a subscription so your coffee never runs out.

Frequently Asked Questions

How often should I clean my coffee machine?
Rinse removable parts after every use, and do a deeper clean of all components weekly.

How often should I descale?
Typically every 1-3 months, depending on your local water hardness and how often you brew.

What happens if I don't descale my machine?
Limescale buildup can affect flavour, reduce heating efficiency, restrict water flow, and eventually damage internal components.

Can I use any descaling solution?
Use a product designed or approved for your specific machine, since some acids can damage certain seals or parts.

Does filtered water reduce how often I need to descale?
Yes — filtered or softened water contains fewer minerals, reducing scale buildup over time.

The Bottom Line

Regular cleaning and descaling protect both your coffee's flavour and your machine's lifespan — a small, consistent habit that makes a genuinely noticeable difference to every cup.

Explore Amici's speciality coffees and find a cup that suits your taste, or set up a regular delivery so fresh coffee keeps arriving.