It is recommended to clean the filter every two weeks. You can wash it with water, but it is important to allow the filter to dry before replacing it in the unit. You can also use a vacuum to clean the filter. When you are finished with the dehumidifier for the season, be sure to empty any water that has been collected in the water bin. Disconnect the hose if you used one, and make sure you replace the drain cap and rubber stopper back into the drain outlet. Make sure you store the unit in a cool place away from sunlight.