If you've started noticing a subtle shift in the flavor of your morning brew, your coffee grinder may be the culprit. A coffee grinder with dull blades cannot properly grind the beans -- the sharper the blade, the finer and fresher the cut or grind of the coffee. Regular cleaning and sharpening will help the grinder perform its best, which will result in fresh tasting, flavorful coffee.
Pour one cup of uncooked rice into the coffee grinder.
Grind the rice for up to one minute, just as you would with the coffee beans.
Discard the ground rice.
Unplug the grinder and wipe the blades with a damp cloth, and then with a dry cloth.