How to Clean a Coffee Grinder

Key takeaway: Clean a blade grinder weekly and a burr grinder monthly, more often if you grind oily dark roasts regularly. Uncooked rice is fine for a blade grinder but can damage a burr grinder, so use a brush and a grinder cleaning tablet on burrs instead, and never submerge either type in water.

To clean a coffee grinder, empty the hopper and run it until no more grounds come out, then brush out the chamber and burrs (or blades) to clear built-up oils and stale particles, wipe with a dry cloth, and let everything dry fully before you use it again. Blade and burr grinders need genuinely different treatment, and the method that’s safe on one can damage the other.

Why Grinder Cleaning Actually Matters

Coffee oils build up on grinding surfaces over time no matter how fresh your beans are, and that residue eventually shows up as stale, bitter-tasting coffee even when everything else about your brew is right. It also affects grind consistency, since old, rancid oil coats the burrs or blades and changes how they cut through fresh beans. A grinder that’s never cleaned is quietly working against every other improvement you make to your coffee.

How Often to Clean a Coffee Grinder

Blade grinders benefit from a weekly clean, since they have fewer places for oil to hide but also less consistent grinding to begin with. Burr grinders can generally go about a month between cleans under normal use, a guideline Breville’s own grinder-care advice backs up, though grinding darker, oilier roasts regularly will shorten that. Treat both numbers as a starting point rather than a rule, and clean sooner if you notice grind size drifting or flavour turning stale.

Cleaning a Blade Grinder (Rice Trick)

For a blade grinder, running a small batch of uncooked rice through it for about a minute helps lift oils and residue, since the rice absorbs oil as it’s chopped up. Empty it out, wipe the bowl with a dry cloth, and repeat with a fresh batch if it’s still oily. This trick is specific to blade grinders: uncooked rice is considerably harder than a coffee bean, and running it through a burr grinder can strain or damage the burrs.

Cleaning a Burr Grinder

1. Unplug the grinder before doing anything inside the hopper or grinding chamber.
2. Empty the hopper and run the grinder until nothing more comes out, clearing any beans left in the chute.
3. Disassemble the burr housing if your model allows it, following your manual, for a proper clean rather than just brushing the surface.
4. Use a soft brush to clear built-up grounds and dust from the burrs and chamber.
5. Wipe away oily residue with a dry or barely damp cloth. Don’t soak or submerge the burrs.
6. Let everything dry completely before reassembling, since trapped moisture can cause rust on metal parts.
7. Run a small batch of beans through and discard it before grinding for an actual coffee, to clear any leftover cleaning residue.

Using Grinder Cleaning Tablets

Grinder cleaning tablets, sold under names like Grindz, are a convenient alternative to a full brush-clean on a burr grinder. Set the grind to a medium setting, run the tablets through the hopper the same way you would beans, and they’ll absorb stale oils and grounds as they pass through the burrs. They’re made from food-safe cereals and grains, so a small amount of leftover residue isn’t a health concern, but run a batch of real beans through and discard it afterward anyway, the same way you would after a manual clean.

Common Mistakes

• Running rice through a burr grinder instead of a blade grinder. It’s hard enough to strain or damage burrs, and can void a warranty in the process.
• Submerging burrs or blades in water, or leaving them wet. Both electrical safety and rust risk make this one worth skipping entirely.
• Waiting until flavour has already turned noticeably stale before cleaning, rather than sticking to a rough weekly or monthly schedule.
• Skipping the discard batch after using rice or a cleaning tablet, and brewing your first real coffee with leftover cleaning residue still in the burrs.
• Assuming a grinder built into a machine, like the one on a Breville Barista Express, follows the same cleaning method as a standalone grinder. Always check your specific machine’s manual first.

If your grinder is built into a machine rather than standalone, check that machine’s own guide first: we’ve covered the built-in grinder on our Breville cleaning guide already, with more brand-specific guides to come.

Frequently Asked Questions

Cleaning routine sorted but shopping for a new grinder instead? Our guide to the best coffee grinders in Australia compares six real options against actual owner reviews, from budget burr grinders to serious espresso grinders.