The oven automatically locks the door and heats the oven to a very high temperature for a certain amount of time (usually a couple of hours) and burns off most of the spill over, grease, food, etc that has graced the inside of your oven.
OVEN SELF CLEANING CYCLE
Mix equal parts water and baking soda to create a paste. Use a Scotch-Brite sponge to apply and clean oven
MAKE A BAKING SODA PASTE
Mix 1 1/2tsp Shaklee Basic H2 in a spray bottle, mix and spray on grease. Wipe clean with a paper towel
Place a small amount of Scour Off paste on a Scotch-Brite sponge and water, remove grease and spill over with ease.