First, remove racks and use a dry scrub brush to break up large charred areas and loose crumbs. Use the brush to gather the loose crumbs into a corner and sweep into a dustpan or vacuum with a hose attachment.
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Make a Baking Soda Paste
Next create a paste made of baking soda, water and a squirt or two of dish soap. Mix thoroughly until you have the consistency of mashed potatoes. Depending on your oven size, you may need to mix a second batch.