What is the best way to clean a conical burr grinder?

Cleaning a conical burr grinder is less about aesthetics and more about managing the 'bimodal' distribution of particles and the accumulation of rancid coffee oils. Conical burrs, which feature a top burr nested inside a bottom burr, are prone to trapping 'fines'—the microscopic dust that significantly impacts extraction. Over time, these fines mix with coffee oils to form a hardened, varnish-like layer that alters the friction coefficient of the burrs, leading to inconsistent grind sizes and off-flavors. A common misconception is that running rice through a grinder cleans it; this is dangerous, as rice is harder than coffee beans and can damage burr alignment or stall the motor. Instead, producers and professionals prioritize mechanical removal. The mechanism of a deep clean involves physically exposing the burr set to clear the 'apex'—the narrowest point where the burrs meet—where oil buildup is most aggressive. While cleaning tablets are excellent for absorbing oils from hard-to-reach crevices, they cannot replace the physical removal of compacted grounds. For the farmer and producer, maintaining a clean grinder is the final step in honoring the harvest; failing to clean the equipment effectively masks the delicate acidity and terroir of the coffee with the stale, bitter notes of oxidized oils. Always ensure the grinder is unplugged before disassembly, and if you use a vacuum, be cautious of losing small calibration springs or shims that define the grinder's precision.