If you don't have a self-cleaning oven, combine baking soda and seltzer water and paint it on the sides and bottom of the oven. "Once you have the baking soda on, spray it with white vinegar," says Leslie Reichert, aka The Cleaning Coach, a nationally recognized green cleaning expert. "Let it set overnight and spray every 30 minutes until you go to bed. Then, just wipe it off in the morning."
Leslie Reichert: The Cleaning Coach