Every six months
Not all ovens are self-cleaning. If yours isn't, set it up to clean while you sleep.
1. Remove oven racks and submerge them in hot water and liquid or granular dishwasher soap.
2. Soak overnight to cut down on scrubbing. Spray the interior and door with an oven cleaner. (Spread newspapers under the door to protect the floor from drips.)
3. Let set overnight and then wipe clean the next day with warm water and rags.
4. Run removable knobs through the dishwasher. Scrub stay-on knobs with warm water and dishwashing liquid.
Plan ahead when cleaning. If you plan to cook a big meal, schedule the oven cleaning a few days before or after. The process can create a chemical odor that clashes with cooking smells.