Your upright freezer should be cleaned on a regular basis. They are, however, simple to clean. Weekly cleaning of the freezer's exterior and shelves is recommended, while a comprehensive clean may be required every few months. Shut off the freezer and move the contents to a different freezer or cooler. Soap and water should be used to clean each shelf and compartment. Once the freezer is switched back on, dry the food with a clean dish cloth and put it to the freezer.