It is incredibly important to clean a coffee grinder after each use. Loose particles can remain inside the machine, which can lead to malfunctioning later. Most grinders can be taken apart completely and should be thoroughly washed with soap and hot water. It should then be left to air dry, or you can dry it off with a kitchen towel. Under no circumstance should a coffee bean grinder be cleaned inside a dishwasher. There is another method to clean a grinder though. You can put Grinder Cleaning Tablets or rice in the hopper, run the grinder for a short time, and empty the contents. The remaining components should then be wiped clean with a kitchen cloth, but make sure that any left-over coffee grounds, tablets, or rice are completely removed.