Self-Clean Using High Heat 
The cycle can take 90 minutes to 6 hours, using heat that's 800° F or higher. The door latches shut, ensuring that it can’t be opened while the oven is set to this high temperature. Smoke and a strong odor might occur as the heat breaks down the food soils, leaving ash that easily wipes away with a damp cloth. 

“High temperature self-clean is still the most effective of the self-clean methods,” says Tara. "For most ranges with high-temp cleaning, you can choose from a few cleaning times, say from 3, 4, or 4 hours, depending on the level of soil in your oven.”

More at source:  Consumer Reports

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