While not always necessary after every single use, cleaning your spice grinder regularly, especially after grinding oily spices or different types of spices, is highly recommended to prevent flavor contamination and buildup.
Cleaning your spice grinder helps maintain the purity of flavors. Over time, residue from spices can accumulate, leading to cross-contamination and muddling the taste of freshly ground spices. Oily spices like cumin or coriander tend to leave behind a residue that can become rancid. Grinding different types of spices without cleaning can also transfer flavors, affecting the taste of your dishes. A simple wipe-down after each use, and a more thorough cleaning periodically, will keep your grinder in optimal condition. For a thorough cleaning, unplug the grinder and use a dry brush to remove loose particles. You can also grind a small amount of white rice to absorb any remaining oils and odors. Discard the rice after grinding. Finally, wipe the grinder with a damp cloth and allow it to dry completely before using it again.
Avoid using water directly inside the spice grinder's motor housing, as this can damage the electrical components. Instead, focus on cleaning the removable grinding bowl or chamber with a damp cloth.