How to clean conventional ovens with store bought product

With a little muscle and a powerful cleaner, even the filthiest oven can look new. Since it's best to let the cleaner sit overnight, try to start cleaning before bed.

Make sure that the room is well ventilated. Open doors and windows and turn on any fans to prevent fumes from accumulating.
Take out the oven racks and set on newspapers.
Cover the heating element and the light bulb with aluminum foil.
Spray a thin layer of oven cleaner evenly on all sides. Don’t forget to do inside of the oven door and close the oven when you are done.
Using a metal-friendly cleaner, scrub down the oven racks, and set them to dry on the newspaper.
Let everything sit overnight.
In the morning, take a damp sponge and begin to wipe away the film of cleaner and grease. After each wipe, rinse the sponge in warm water. Continue wiping and rinsing the sponge until the oven surface is spotless.
For stubborn grime, you may need to reapply a small amount of oven cleaner directly to the dirty spot and wait an additional hour before further scrubbing.
Remove and discard the aluminum foil coverings.
Empty the dirty water and refill the bucket with warm water and wipe the interior of the oven again to remove any remaining residue.
Avoid future grime build-up by lining the bottom of the oven with aluminum foil for especially messy cooking jobs, like roasting a chicken or baking a pie.
Place the racks back into the oven.
Heat the oven to 300 degrees for 15 minutes. It is best to keep pets (especially birds) out of the room until any smoke and fumes dissipate.
Although electric stoves were available as early as the 1890s, they didn't start to compete with gas stoves until the late 1920s.