Disassemble the grinder
Tap out loose debris
Freeze the grinder for 15 to 30 minutes
Use a small brush or toothpick to remove stuck material
Soak metal parts in isopropyl alcohol
Scrub with a toothbrush or small brush
Rinse metal parts with warm water
Wash non-metal parts with warm soapy water
Dry all parts completely
Reassemble the grinder
Clean it regularly to prevent buildup