A brush is integrated in the bottom rotating grindstone of your Octagon Grain Mill, which sweeps out the flour with every rotation, thereby automatically cleaning the mill.If you don’t intend to use your mill for a prolonged period of time, we recommend cleaning any leftover flour out of the grinder. This is very easy with a vacuum cleaner. Set the adjusting lever to “coarse” and then, after having turned off the mill, insert the vacuum cleaner nozzle into its funnel and flour outlet.Do not in any case clean the housing with abrasive cleaners. Never immerse the unit in water! If necessary, clean the housing with a damp cloth and then rub in a small amount of vegetable oil to preserve the surface.Refer to the Octagon Grain Mill HM-OCTA user manual for more information.