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If you use a spice or coffee grinder, here's a handy tip. When you are finished grinding, cut a piece of plain bread in quarters, and grind it. It will flush the spice or coffee dust out of all the nooks and crannies. Then toss the bread crumbs in the yard for the birds.
Source: Local TV guide
If your coffee grinder takes longer than it should to work, instead of thinking about replacing it, just resharpen the blades. Toss in a handful of uncooked rice. The rice will re-sharpen your blades for you.