Incrustations in the oven: get the degreasing product from the kitchen

The oven, being a cooking device widely used on a weekly basis, is easily prone to dirt incrustations. The latter is in fact due to oil splashes and food remains that solidify or carbonize due to heat. These deposits affect the aesthetics of the oven, while favoring the spread of bad odors. However, the higher risk is the health consequences. Therefore it is important to carry out regular maintenance of the internal and external compartment of the oven. But if the damage has already been done, here is the solution to the problem.
What to do first?

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