Depends what you call chemical free. I scour ours with dishwashing liquid (steaming is probably a good idea to help loosen it). And the racks I soak in laundry washing powder overnight (no scrubbing required.. it just falls off! Just a light rub gets the remainder off.. and maybe a toothbrush for the fiddly bits). Have thought about spraying a laundry powder solution over the inside of the oven as well next time. Might help lift it more easily.
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