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The short answer: to clean a burr grinder, unplug it, empty the hopper, lift out the upper burr and brush the old grounds and oily dust off both burrs and the chute, then reassemble it and grind a few grams of coffee to settle it. Do this every two to four weeks. Between deep cleans, a cleaning tablet such as Urnex Grindz clears residue without taking anything apart. Blade grinders only need a dry wipe and a brush. Never put water near the motor or the burrs.
Check Urnex Grindz prices on Amazon UK
Below are the steps for each type of grinder, how often to clean, what to avoid and what to use. If you are still choosing a grinder, our guide to the best burr grinders in the UK compares the main electric models.
How this guide was put together
Based on manufacturer specifications and owner reviews. The steps follow the care instructions in Sage’s Smart Grinder Pro manual, Urnex’s own directions for Grindz as published by retailers, and the grinder care advice from Moccamaster’s support pages. We also looked at Reddit home barista threads on grinder cleaning to see which problems owners run into. Prices checked November 2026 on Amazon UK and 200degs.com.
Why you should clean a coffee grinder
Coffee beans carry oils, and every time you grind, a little of that oil and a fine dust of old grounds stays behind on the burrs, in the chute and around the outlet. After a week or two that residue goes stale. It then mixes into each fresh dose, which can make coffee taste flat or slightly bitter even when the beans are good.
Build-up also changes how the grinder behaves. Packed grounds can clog the chute, make the grind less even and cause the motor to work harder. Darker, oilier roasts leave residue faster than light roasts, so they need cleaning more often.
How often to clean a coffee grinder
| Task | How often | Time |
|---|---|---|
| Brush the outlet and wipe the outside | Every few days | 1 minute |
| Wash the hopper and grounds bin | Every 1 to 2 weeks | 5 minutes |
| Remove the upper burr and brush both burrs | Every 2 to 4 weeks | 10 to 15 minutes |
| Cleaning tablets (Grindz or similar) | Every 1 to 3 months | 5 minutes |
If you grind oily dark roasts every day, lean towards the shorter gaps. A light roast filter drinker who grinds once a day can stretch them. Clive Coffee, quoting Urnex, suggests running Grindz through every couple of months.
What you need
- A stiff, dry brush. Many grinders come with one; if yours did not, a natural bristle coffee grinder cleaning brush costs about £6 on Amazon UK.
- A dry microfibre cloth or paper towel.
- A small vacuum or a hand air blower for the chute (optional, but it saves time).
- Grinder cleaning tablets for the in-between cleans.
- A handful of cheap or old beans to purge the grinder afterwards.
Check Coffee Grinder Cleaning Brush prices on Amazon UK
How to clean a coffee grinder with burrs (electric)
This is the deep clean for electric burr grinders such as the Sage Smart Grinder Pro, Baratza Encore or De’Longhi KG521. The exact way the burr comes out varies by model, so check your manual for that step.
- Run it empty, then unplug it. Grind until no beans are left, then switch off at the wall and pull the plug. Sage’s manual says to unplug before any cleaning.
- Take off the hopper. Note your grind setting first, or take a photo of the dial, so you can put it back.
- Lift out the upper burr. On most home grinders it twists or lifts out by its handle. The lower burr usually stays in place.
- Brush both burrs. Work the brush into the teeth of the upper burr and around the lower burr until the oily dust is gone. A vacuum nozzle held near the burr chamber picks up the loose grounds.
- Clear the chute. Brush or blow through the exit chute, which is where clumps tend to build up and block the flow.
- Wash the removable plastic parts. The hopper, lid and grounds bin can go in warm soapy water. Rinse them and let them dry completely before they go back on. Sage says not to put any grinder parts in the dishwasher.
- Reassemble and reset. Push the upper burr firmly back into place, lock the hopper and return the dial to your usual setting.
- Purge. Grind 10 to 20g of old beans and throw the grounds away. This seats the burrs and clears any dust you loosened.
After a deep clean, expect to tweak your grind by a step or two, because removing the burr can shift it slightly. Our coffee grind size chart helps if you need to dial in from scratch.
How to clean a coffee grinder with cleaning tablets
Cleaning tablets are made from food-safe grains shaped like coffee beans. They scrub oil and stale grounds out of the burrs as they pass through, so there is nothing to take apart. They don’t replace a full deep clean, but they keep the grinder fresh in between. These are the steps Urnex gives for Grindz, as published by Clive Coffee:
- Empty the hopper and set the grinder 3 to 4 steps coarser than usual.
- Grind one 35g dose of tablets and throw the output away.
- Grind about 40g of old coffee to push out any tablet residue, then throw that away too.
- Set the grinder back to your normal setting.
Some bean-to-cup machine owners use Grindz too, since their built-in grinders are hard to reach. Check your machine’s manual first, because some makers have their own guidance. Our guide to the best bean to cup coffee machines covers those machines.
What owners say about Urnex Grindz
4.6 out of 5 from 5,768 Amazon UK ratings for the 430g tub (checked November 2026), with 75% of them five stars. Owners like that it cleans a burr grinder without taking it apart, and several bean-to-cup owners use it on their machine’s grinder. The common warning is to purge with cheap beans afterwards: one long-standing Amazon UK review puts odd-tasting coffee down to skipping that step. A few owners say they noticed no change in taste and use it simply as maintenance. One tub lasts a long time at roughly 35 to 40g a clean.
Check Urnex Grindz prices on Amazon UK
How to clean a blade grinder
Blade grinders are simpler, but the motor sits in the base, so the whole unit must stay dry.
- Unplug it and tip out the loose grounds.
- Brush around the blades and the bowl. Mind your fingers, as the blades are sharp.
- Wipe the bowl with a barely damp cloth, then a dry one. Never pour water into it or dunk it.
- Wash the lid in warm soapy water if your model’s lid comes off, and dry it before refitting.
You will often see the tip of grinding a spoonful of dry rice to absorb oil and smells. That is common advice for blade and spice grinders, but do not do it in a burr grinder. Moccamaster’s support pages warn that rice is harder than most coffee beans and can damage a grinder’s motor, can leave starchy residue and may void the warranty.
How to clean a hand grinder
Manual grinders such as the Timemore C2, 1Zpresso and Comandante come apart by hand, which makes them the easiest to deep clean.
- Note your setting (count the clicks from fully closed).
- Unscrew the adjustment dial and slide out the burr and shaft, following the maker’s instructions.
- Brush the inner and outer burr and blow out the body.
- Wash only the parts the maker says are washable, such as the catch cup, and dry everything fully so the burrs and bearings don’t rust.
- Reassemble, find zero, and set your clicks again.
Our roundup of the best hand grinders in the UK covers which models are easiest to take apart.
Mistakes to avoid
- Water on the burrs or motor. Steel burrs can rust and water can reach the electrics. Sage’s manual says never to immerse the grinder, plug or cord in liquid.
- Rice in a burr grinder. See above: it is hard on the motor and leaves starch behind.
- The dishwasher. Sage tells owners not to wash any grinder parts or accessories in one.
- Abrasive cleaners. Sage also warns against alkaline or abrasive cleaners, steel wool and scouring pads, which damage the surfaces.
- Skipping the purge. The first grams after a clean carry dust and tablet residue, so don’t brew with them.
The same habits keep the rest of your kit in shape. If you also own an espresso machine, our guide on how to descale an espresso machine covers the other half of routine care.
What beans to use after cleaning
Use old or cheap beans for the purge, then go back to fresh coffee. Our everyday coffee at home is 200 Degrees Brazilian Love Affair, which 200 Degrees describes as its signature espresso blend: a medium roast with plenty of body, a good crema and a strong, bold finish. It is £11.50 for 250g or £35.95 for 1kg as whole beans, and it is also sold ground if you want a backup bag for days the grinder is apart.
Check Brazilian Love Affair at 200 Degrees
If you get through a bag every week or two, the Brazilian Love Affair subscription brings the price down to £9.95 for 250g or £31.95 for 1kg.
Check the Brazilian Love Affair subscription at 200 Degrees
FAQ
How do you clean the inside of a coffee grinder?
Unplug it, remove the hopper and upper burr, then brush the burrs and chute and vacuum out the loose grounds. If you don’t want to take it apart, grind cleaning tablets through it and purge with old beans.
What can I run through a coffee grinder to clean it?
Grinder cleaning tablets such as Urnex Grindz, followed by a small dose of old coffee. Rice is often suggested, but grinder makers advise against it in burr grinders because it can strain the motor and leave starch behind.
Can you put water in a coffee grinder to clean it?
No. Water can rust steel burrs and reach the motor. Only the removable hopper, lid and grounds bin should be washed, by hand, and dried fully before refitting.
Are you supposed to wash coffee grinders?
You wash the plastic parts that come off, not the grinder itself. The burrs and body are cleaned dry with a brush, a cloth and, if you like, a vacuum.
How do I know my grinder needs cleaning?
Common signs are coffee tasting flatter than usual from beans you know, more clumps or static, grounds sticking in the chute, or a grind that drifts finer or coarser without you touching the dial.
Bottom line
Learning how to clean a coffee grinder takes ten minutes and saves you from stale-tasting coffee. Brush the outlet every few days, deep clean the burrs every few weeks, and run cleaning tablets every month or two. Keep water, rice and the dishwasher away from the grinder and always purge with old beans before you brew again.
Check Urnex Grindz prices on Amazon UK
For the full manufacturer instructions, see the Sage Smart Grinder Pro quick guide.
