Category: Machine Care

Coffee beans contain oils that build up inside grinders over time. Old grounds and oils can go stale, affect flavor and clog the grinder. Regular cleaning keeps your coffee tasting fresh and helps your grinder last longer.

This guide explains how to clean burr and blade grinders, how often to do it and what products to use. Always check your grinder’s manual, since some models have specific cleaning instructions or parts that should not get wet.

Why Clean Your Grinder?

• Better flavor: Stale oils and old grounds can make coffee taste rancid or flat.
• Consistent grind: Buildup can affect burr performance.
• Longer life: Clogs can strain motors.
• Less mess: Built-up fines can cause clumping and static.

How Often to Clean

It depends on how much you use the grinder and what you grind:

• Light cleaning: Brush out the chute and hopper every week or two.
• Deeper cleaning: Disassemble and clean burrs every month or two for daily use.
• More often if you use dark, oily roasts, which leave more residue.

What You Need

• Soft brush (many grinders include one)
• Microfiber cloth
• Grinder cleaning tablets (optional)
• Vacuum or air blower (optional)
• Toothpicks or wooden skewers for tight spots

Cleaning a Burr Grinder

Step 1: Unplug the Grinder

Always unplug before cleaning to prevent accidental operation.

Step 2: Empty the Hopper and Bin

Remove remaining beans and grounds.

Step 3: Remove the Upper Burr

Many grinders let you remove the upper burr by twisting it out. Follow your manual. Note the grind setting before disassembly.

Step 4: Brush the Burrs

Use a soft brush to remove grounds and oils from the upper and lower burrs and the grinding chamber.

Step 5: Clean the Chute

Brush or gently vacuum the exit chute, where fines and clumps collect.

Step 6: Wipe the Hopper and Bin

Wash removable plastic hoppers and bins with warm, soapy water if the manual allows, then dry completely.

Step 7: Reassemble

Replace the burr carefully and return the grinder to your usual setting. Grind a small amount of coffee to clear any remaining residue before brewing.

Do Not Wash Burrs in Water

Unless the manufacturer says otherwise, avoid washing burrs or motor housings with water, which can cause rust or damage electronics.

Using Grinder Cleaning Tablets

Grinder cleaning tablets, such as Urnex Grindz, are made from food-safe grains designed to absorb oils and dislodge particles.

1. Empty the hopper.
2. Grind the recommended amount of tablets.
3. Grind a small amount of coffee to flush any remaining residue.

Check whether your grinder manufacturer recommends tablets.

What About Rice?

Some people grind uncooked rice to clean grinders. Many manufacturers advise against it because rice is harder than coffee and may strain motors or damage burrs. Use products designed for grinders or follow your manual.

Cleaning a Blade Grinder

1. Unplug the grinder.
2. Brush out grounds from the blade area.
3. Wipe with a damp cloth, avoiding the motor housing.
4. Optional: Some people grind a small amount of dry bread or rice to absorb oils. Check your manual first.
5. Dry completely before reassembling.

Removable bowls can often be washed. Check the manual.

Cleaning Hand Grinders

1. Disassemble according to the manufacturer’s instructions.
2. Brush burrs and the interior.
3. Wipe the body with a dry or slightly damp cloth.
4. Avoid soaking burrs unless the manufacturer allows it.
5. Reassemble and recalibrate if needed.

Tips to Keep Your Grinder Cleaner

• Grind only what you need.
• Keep the hopper empty or nearly empty if you do not use the grinder daily. Beans in the hopper go stale faster.
• Use fresh beans. See how to store coffee beans.
• Reduce static. Some people use a drop of water on beans before grinding.
• Brush the chute regularly.

Signs Your Grinder Needs Cleaning

• Stale or rancid flavors in your coffee
• Slower grinding
• Clumpy grounds
• Visible oily buildup

Signs Your Burrs Need Replacing

Burrs wear over time. Signs may include:

• Inconsistent grind size even after cleaning
• More fines than usual
• Difficulty reaching fine settings

Many brands, such as Baratza, sell replacement burrs. See our guide to coffee grinders for beginners.

Grinder Care and Espresso

Espresso grinders work at fine settings, making them more sensitive to buildup. Clean them regularly to maintain consistent shots. See how to dial in espresso.

Combining Grinder Care With Machine Care

Set a regular schedule for all your coffee gear: clean the grinder, wash your brewer and descale your machine. See how to descale an espresso machine.

A Simple Monthly Coffee Gear Checklist

• Brush out the grinder chute and burrs
• Wash the hopper and grounds bin
• Clean your brewer, carafe and filter basket
• Backflush your espresso machine if your model supports it
• Check whether your machine’s water filter needs replacing
• Note the date so you know when the next deep clean is due

Following a routine like this keeps flavors fresh and helps you catch wear early.

Understanding Grind Retention

Retention refers to grounds that stay inside the grinder after grinding. Retained grounds can go stale and end up in your next brew. Single-dose grinders are designed to reduce retention, and some people use small bellows or tap the grinder to clear grounds. Cleaning the chute regularly also reduces retention.

Cleaning Before Storage

If you put a grinder away for a while, clean it thoroughly first. Leftover grounds and oils can go rancid and make the next coffee taste off. Store it in a dry place, and run a small amount of coffee through it before brewing again.

A Note on Safety

Never put fingers or tools near the burrs or blades while the grinder is plugged in. Some grinders have sharp burr edges, so handle them carefully during cleaning. If parts are damaged or missing, contact the manufacturer for replacements instead of improvising.

Frequently Asked Questions

How often should I clean my coffee grinder?

Light cleaning every week or two and a deeper clean every month or two for daily use is a common approach.

Can I wash my grinder burrs with water?

Check your manual. Many manufacturers recommend brushing rather than washing to avoid rust.

Are grinder cleaning tablets safe?

Many are made from food-safe ingredients and designed for grinders. Check your manufacturer’s recommendations.

Should I use rice to clean my grinder?

Many manufacturers advise against rice. Use products designed for grinders.

Why does my coffee taste stale even with fresh beans?

Old oils and grounds in the grinder can affect flavor. Try cleaning it.

The Bottom Line

Cleaning your grinder removes stale oils and grounds that affect flavor and performance. Brush out the chute and burrs regularly, do a deeper clean every month or two, use grinder cleaning tablets if your manufacturer approves and avoid washing burrs with water unless instructed. A clean grinder makes fresher-tasting coffee and lasts longer.

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Editorial note: Brew Benchly is independent and reader-supported. This guide is based on research into manufacturer documentation, published specifications and widely accepted best practices; we have not been paid to mention any product. If we add affiliate links in the future, they will be clearly disclosed per our Affiliate Disclosure.

Over time, minerals from water build up inside coffee machines. This buildup, called scale, can slow water flow, affect temperature, change flavor and shorten the life of your machine. Descaling removes these deposits and is one of the most important maintenance tasks for espresso machines and drip coffee makers alike.

This guide explains why descaling matters, how often to do it and a general process. Always follow your machine’s manual first, since manufacturers often specify descaling products and procedures, and using the wrong method can affect warranty coverage.

What Is Scale?

Scale is a hard, chalky deposit made mostly of calcium and magnesium carbonates that come from hard water. When water is heated, these minerals can come out of solution and stick to boilers, heating elements, tubes and valves.

Why Descaling Matters

• Maintains flow: Scale can narrow water paths and clog components.
• Protects heating elements: Scale can insulate elements, affecting heating.
• Improves taste: Mineral buildup can affect flavor.
• Extends machine life: Many manufacturers note that scale-related damage may not be covered under warranty.

How Often Should You Descale?

It depends on:

• Water hardness: Hard water causes more buildup.
• Usage: More use means more scale.
• Machine type: Some machines have descale indicators.

Many manufacturers suggest descaling every one to three months for regular use with hard water, or follow the machine’s indicator. Check your manual.

Testing Water Hardness

Water hardness test strips are inexpensive and widely available. Your local water utility may also publish hardness information.

Descaling Products

Manufacturer Descalers

Many brands sell their own descaling solutions, such as Breville, De’Longhi and Keurig. Using the recommended product is often the safest choice.

Citric Acid and Lactic Acid Descalers

Many general-purpose coffee machine descalers use citric acid or lactic acid. Follow product instructions for dilution.

Vinegar

Vinegar is a common household option for some drip coffee makers, but many espresso machine manufacturers advise against it because it can leave odors and may affect certain components. Check your manual before using vinegar.

General Steps: Descaling an Espresso Machine

These are general steps. Your machine’s manual takes priority.

1. Read the manual for specific instructions and any descale mode.
2. Remove water filters from the tank if your machine uses one.
3. Empty the drip tray and remove the portafilter.
4. Mix descaler and water in the tank according to the product’s instructions.
5. Start the descale cycle if your machine has one, or run solution through the group head and steam wand in intervals.
6. Let the solution sit if instructed, allowing it to dissolve scale.
7. Finish running the solution through the system.
8. Rinse thoroughly: Empty the tank, refill with fresh water and run several tankfuls through the group head and steam wand.
9. Reinstall filters and reset the descale indicator if applicable.

General Steps: Descaling a Drip Coffee Maker

1. Check the manual for recommended descalers.
2. Fill the reservoir with descaling solution.
3. Run a brew cycle without coffee. Some machines have a clean cycle.
4. Pause midway if recommended, letting the solution sit.
5. Finish the cycle and discard the solution.
6. Run fresh water cycles several times to rinse.
7. Wash the carafe and basket.

Descaling Kettles

Electric kettles also build up scale. Use a kettle descaler or citric acid solution following product instructions, then rinse thoroughly.

Descaling vs. Cleaning

Descaling removes mineral buildup. Cleaning removes coffee oils and residue. Espresso machines also need regular backflushing (if supported), basket cleaning and steam wand purging. Grinders need separate cleaning. See how to clean a coffee grinder.

Reducing Scale Buildup

• Use filtered water as recommended by many manufacturers.
• Use your machine’s water filter if it has one, and replace it on schedule.
• Avoid distilled water unless the manufacturer recommends it. Some machines rely on minerals for sensors, and very soft water may affect taste.
• Empty and refresh the water tank regularly.

Signs Your Machine Needs Descaling

• Slower water flow or longer brew times
• Coffee not as hot as usual
• White, chalky deposits
• Unusual noises
• Descale indicator lights

Safety Tips

• Let the machine cool before handling internal parts.
• Avoid contact with hot water and steam.
• Keep descaling products away from children and pets.
• Do not mix cleaning chemicals.

Making Maintenance a Habit

Set calendar reminders for descaling and filter changes. Keep descaler and spare filters on hand. Pairing maintenance with a regular day, such as the first weekend of the month, makes it easier to remember.

For more on machines, see our guides to espresso machines under $500, the Breville Bambino and drip coffee makers.

Water Quality and Scale Prevention

Scale forms from minerals in water, so the water you use has a big effect on how often you need to descale.

• Check your water hardness. Many local water utilities publish water quality reports, and inexpensive test strips are available.
• Use the machine’s water filter if it has one, and replace it on schedule.
• Consider filtered water if your tap water is very hard.
• Avoid distilled or fully demineralized water unless your manufacturer approves it. Some machines rely on a small amount of minerals for sensors, and many coffee experts note that some minerals help with extraction.

Daily Habits That Help

• Empty and rinse the drip tray regularly.
• Purge the steam wand and wipe it after every use.
• Rinse the group head by running a short flush of water after brewing.
• Refill the tank with fresh water instead of topping up old water.

These habits will not replace descaling, but they help keep your machine cleaner between cycles.

Cost of Descaling

Descaling is inexpensive compared with repairs. Manufacturer-branded solutions are often more expensive than generic coffee-machine descalers, but some manufacturers specify their own product to protect warranty coverage, so check before switching. Water filters add a small ongoing cost but can reduce how often you need to descale.

When to Call for Service

Descaling will not fix every problem. If your machine leaks, trips a breaker, makes unusual grinding or pump noises, or still has low flow after descaling, stop using it and contact the manufacturer or an authorized service center. Opening the machine yourself may void the warranty and can be unsafe because of electricity, heat and pressure.

Frequently Asked Questions

Can I use vinegar to descale an espresso machine?

Many espresso machine manufacturers advise against vinegar. Check your manual.

How long does descaling take?

It varies by machine, often around 20 to 45 minutes including rinsing.

What happens if I never descale?

Scale can build up, affecting flow, temperature and taste, and may contribute to machine damage.

Is filtered water enough to prevent scale?

Filtered water can reduce scale but may not eliminate it. Regular descaling is still recommended.

Do single-serve pod machines need descaling?

Yes. Most pod machines recommend periodic descaling.

The Bottom Line

Descaling removes mineral buildup that can slow your machine, affect flavor and shorten its life. Follow your manufacturer’s instructions and recommended products, descale on a schedule based on water hardness and use and rinse thoroughly afterward. Using filtered water and a machine filter can reduce how often you need to descale.

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Editorial note: Brew Benchly is independent and reader-supported. This guide is based on research into manufacturer documentation, published specifications and widely accepted best practices; we have not been paid to mention any product. If we add affiliate links in the future, they will be clearly disclosed per our Affiliate Disclosure.