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Put burners in ziplock bag, add 1/2 cup of ammonia and let sit overnight, and in the morning wipe clean with a sponge/rag! I do this with my oven racks too. Don't try with aluminum, but if you get that black stuff on the bottoms (or inside if you *really* burn it) of stainless steel pans, it works great on them too. I just use garbage bags for the really big things.