The majority of stoves sold on the market today have a self-cleaning feature that burns off grease and spills from the interior of the oven. When this feature is turned on, the door locks and the oven heats up to extremely high temperatures (500 Fahrenheit and more). The self-clean cycle usually runs for 3-5 hours, omitting a strong smell from the oven as the residue burns off. This function is designed to prevent users from having to manually scrub off grime from the oven, a difficult task that usually involves using toxic cleaning agents.
In gas stoves, this feature adds a premium to the average price; gas stoves without a self-cleaning feature retail for around $750, while ranges that have the feature average at about $1400. Gas stoves that don't have a self-cleaning setting tend to have fewer features overall, like convection heating or extra burners.