If you have a coffee grinder like the one pictured above, you know how difficult it can be to get it clean. According to
Real Simple Magazine, you can clean the oils from the grinder by running it with about 1/4 cup rice. The rice will absorb the oils and clean the grinder.
Another option is grinding up a piece of stale bread. It, too, will absorb the oils. Simply wipe out the breadcrumbs and your set for a fresh grind.
