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Our everyday oven, on gas stoves, makes the grease that splatters on the walls disappear through a chemical reaction. This happens when the sides and bottom of the oven are covered with a glaze that leaves the surface full of pores. The cooking fat drips into these holes and reacts with the coating, disintegrating by catalysis, that is, quickly – the hot air from the oven causes the residues to evaporate. Obviously, to clean unglazed parts, such as grilles, the door and the lining on the underside, just a manual scrubbing. In electric ovens, cleaning is more violent and does not just remove grease, no! The process, called pyrolysis, transforms any trace of food stuck in the oven into ashes, after two hours at a temperature of 500ºC – to pay for this automatic cleaning, just ignoring the electricity bill.