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Although any type of foil will do the trick, going for the heavier variety provides you with better cleaning opportunities. The grill brush will help you remove the loosened caked on food particles and clean the rack. Preparation is key to keeping the grill in better shape for future cooking. Pick up a can of non stick cooking spray, a clean wet cloth and warm soapy water. You can mix soap and water in a pan and keep near the grill for post cleaning.

Summary:
Purchase/find a box of heavy duty aluminum foil. Locate your grill brush or head out to purchase one. Grab supplies that will help you maintain a clean grill in the future.