Ideally, you should clean your oven the same day the spills occur—steam cleaning is most effective with fresh spills.
A self-cleaning oven cycle gets a deeper clean than a steam-cleaning cycle, which makes it ideal for sticky, baked-on messes ...
Follow the instructions ... grease and residue with a clean sponge or cloth. If you want a less abrasive option, steam can soften grease for easier removal. Place an oven-safe bowl of water ...