Coffee oils go rancid. A grinder that hasn't been cleaned in six months adds a stale, slightly bitter undertone to every cup — even when the beans are fresh. The fix takes 10 minutes a month. Here's how.
Step-by-step
Empty the hopper and unplug the grinder
Pour any unused beans into a sealed jar (they'll be fine for tomorrow's brew). Unplug the grinder before removing any parts — burr grinders can be unsafe to disassemble while connected.
Run grinder cleaning tablets
Add a single dose of Urnex Grindz tablets (about a tablespoon) to the hopper and run the grinder as if grinding coffee. The tablets are food-safe and absorb the rancid oils that water and beans can't reach.
Brush out the chute and burr area
Use a soft coffee-brush set to clear loose grinds from the burr chamber, exit chute, and hopper neck. A small soft-bristle brush gets into corners better than wiping with a cloth.
Wipe the hopper with a dry cloth
Microfiber works best. Skip water unless your grinder's manual specifically allows it — most domestic burr grinders aren't sealed and water can damage the motor.
Run a small dose of throw-away coffee beans
Grind 1 tablespoon of cheap beans and discard. This clears any tablet residue from the burrs and confirms your grind setting is unchanged. The next batch you grind tastes noticeably cleaner.
Recommended Gear
The gear we'd reach for. Prices shown on Amazon at click-through.
Urnex Grindz Coffee Grinder Cleaning Tablets
everyday
Food-safe grinder cleaning tablets — run through the burrs like beans, absorb rancid oils that water can't reach.
Check Price on Amazon →
OXO Good Grips Coffee Maker Cleaning Brush Set
budget-friendly
Soft-bristle brush set for cleaning chutes and burr chambers without scratching coatings.
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Urnex Cafiza Espresso Machine Cleaning Powder
everyday
Bonus for espresso owners — Cafiza powder for cleaning the espresso machine after deep-cleaning the grinder.
Check Price on Amazon →Frequently Asked Questions
How often should you clean a coffee grinder?
A quick brush-out weekly; a full Grindz-tablet deep clean monthly. If you drink dark roasts or oily beans, lean toward weekly deep cleans — the oils accumulate faster. The signal that you're overdue is a slight stale or rancid note in the cup that doesn't go away with fresh beans.
Can you clean a coffee grinder with rice?
Not on burr grinders — rice is harder than coffee and can damage or dull the burrs. Blade grinders tolerate rice as a poor-man's cleaning method, but coffee-specific cleaning tablets (Urnex Grindz) are designed for the job and won't damage your burrs.
How do you clean a burr grinder without taking it apart?
Grinder cleaning tablets work without disassembly: run them through the grinder like beans, then brush the chute and hopper. For the deepest clean, the burrs eventually come out for a wipe with a dry brush, but tablets handle 95% of maintenance without ever opening the unit.
How often should you clean a coffee grinder?
Quick brush-out weekly; full Grindz-tablet clean monthly. Dark-roast and oily-bean drinkers should lean toward weekly deep cleans — oils accumulate faster. The signal you're overdue is a stale or rancid note in the cup that doesn't go away with fresh beans.
Want to dig deeper? See our guides to Best Coffee Grinder (2026), Best Espresso Machine (2026), and Best Drip Coffee Maker (2026).