If not cleaned, the residual coffee powder will absorb odors and directly affect the taste of the next brewed coffee. Invert it upside down and pour out the remaining coffee from the grinding core; You can use a toothbrush or other brushes to remove residual coffee powder from the coffee box, the movement below, and other areas; Finally, it would be even better to blow it with a hair dryer. Before reuse, grind a little beans first, pour them out, and then grind them to minimize the impact of residual coffee powder.