Ammonia -- Water -- Baking soda -- Preheat to 200° then turn off -- In a heat safe glass dish, fill with ammonia and set on middle rack (about 1 to 2 cups of ammonia). -- In another dish, fill with boiling water and set on bottom rack (2 cups) -- Leave overnight -- The next morning, remove dishes and wipe down the inside with a hot wet sponge first drizzled with baking soda. Full instructions >> http://www.madefrompinterest.net/2013/04/oven-cleaning/
How to clean your oven - Heat oven to 60. Boil a pot of water. When the oven reaches 60, turn it off. Put 1 cup ammonia on the top rack, the hot water on the bottom rack, close the door, and leave overnight. The next day, open all doors & windows, remove and keep liquids. Leave the oven open for 15 minutes. Add 1 tsp dishwashing soap (with NO bleach) & 4 cups hot water to ammonia. Wear kitchen gloves. Wipe clean with ammonia water.