If it's a tick layer of burned fat I would firts sprinkle with
vinegar, let soak, then scrape with a plastic blade and wipe off.
You may need a second pass, which is a (warm) breeze if it's a
self-cleaning oven, more of a chore with nasty chemicals if not.
An old method of oven cleaning was to place a saucer or pan of
ammonia in the oven when the oven is warm but turned off. Let it
sit overnight. Should clean off easily the next morning.
(top posted for your convenience)
Keep the whole world singing . . . .
DanG (remove the sevens)
A very strong solution of lye, also known as caustic soda or sodium
hydroxide, and a coarse pad of steel wool or a plastic scrub brush
(don't use natural bristles). You shouldn't have to scrub very hard.
Wear rubber gloves. Let the lye soak in a little before you scrub it.
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