To clean exterior and interior walls, dissolve 2 tbs. baking soda in 1 qt warm water and wipe all surfaces. For stubborn spots, rub with baking soda paste. Be sure to rinse with a clean, wet cloth. (This works well on other enamel-finished appliances as well.) To clean interior fixtures, such as vegetable bins and shelves, wash in hot soapy water, rinse well and dry.