To clean your coffee grinder, blend a grinder cleaning tablet in your grinder. Blend on a medium power until cleaning tablets are smooth. Pour out the smooth cleaning tablet (make sure you give it a gentle tap to get the tablets out). Unplug the grinder and wipe clean the interior with a damp cloth or towel.
An alternative to grinder cleaning tablet is rice. If a cleaning tablet is not readily available to you. Make use of rice in the process.
You can also remover the burr from your grinder (check manual), and then use a soft brush to wipe clean the prongs.