After using the Ooni Karu, it is important to clean out the ash and debris from the inside of the oven. The easiest way to do this is by using a damp cloth or brush to sweep out all of the ashes from the bottom and sides. You can also use a vacuum cleaner with an attachment for small particles if necessary. Additionally, make sure to wipe down the outside of the oven with a dry cloth to get rid of any grease or dirt that may have accumulated during cooking.