Dry the racks completely and place them back on the grill. Dip a paper towel in vegetable oil and apply oil across the racks to help extend longevity.
Fill a bucket with warm water and dish soap. Once the racks are completely cooled, place them in the soapy water and scrub with a sponge or scrubbing pad to remove remaining grime.
TURN OFF OR REDUCE HEAT. Scrape warm racks with a long-handled grill brush to remove grease and keep your hand at a safe distance from heat. For porcelain racks, opt for a soft bristle or nylon cleaning brush to protect the enamel.
WITH THE RACKS ON THE GRILL, apply high heat with the lid closed for 10 to 15 minutes. The high temperature will help loosen hardened grease and leftover food.