Deep-Cleaning a Burr Grinder

Why Grinder Cleaning Requires Dry Methods Only

Water damages coffee grinder burrs — it promotes rust on hardened steel burrs, causes burr edges to dull faster, and can seep into the motor housing. The correct approach uses dry tools: brushes, compressed air, and cleaning tablets that absorb oil without moisture. The goal is to remove retained grounds from burr surfaces and the grind chute, both of which accumulate stale coffee that degrades subsequent shots.

Standard Cleaning (Weekly for Home Use)

1. External brush: Use a stiff-bristle brush to clear the grind chute opening and the portafilter cradle (if present). Coffee grounds accumulate here between doses and go stale within hours. 30 seconds, should be done after every use.

2. Run cleaning tablets: Grindz or Cafetto cleaning tablets — load like a dose of coffee, grind normally, then grind a small amount (5–7g) of real coffee to purge tablet residue. This absorbs oils from burr surfaces and sweeps retained grounds through the system. Monthly for light use.

Deep Cleaning (Every 2–3 Months)

1. Disassemble burrs: Remove the top burr (consult your grinder's manual — most require a specific tool or coin to unlock). The bottom burr is usually fixed.

2. Brush both burr surfaces: Use a soft brush to sweep grounds from the burr teeth. Don't apply lateral pressure on burr edges — you're sweeping, not scrubbing.

3. Brush the grind chamber walls: A stiffer brush or soft toothbrush reaches the chamber interior where grounds cake against the walls over time.

4. Compressed air (optional): A brief burst through the grind chute clears any remaining grounds from the path between burrs and portafilter. Don't blow toward the motor.

5. Reassemble and grind a small test dose.