A good hand grinder you can take apart enough to clean it of any debris. As you’re only putting roasted coffee beans in there, it shouldn’t be a hospitable environment for pathogens to grow as there’s not enough moisture (with proper storage). There’ll probably also be a permanent layer of oils from the coffee beans protecting the burrs from rusting.
You clean it with a brush
yeah ok. i’ve seen too many poorly designed kitchen utensils who have cavities that are basically impossible to ever get clean again. so i’m biased.
A good hand grinder you can take apart enough to clean it of any debris. As you’re only putting roasted coffee beans in there, it shouldn’t be a hospitable environment for pathogens to grow as there’s not enough moisture (with proper storage). There’ll probably also be a permanent layer of oils from the coffee beans protecting the burrs from rusting.