First, make a cleaning paste. Mix two tablespoons of baking soda, one tablespoon of dishwashing liquid, and a little water in a bowl. It is important that the consistency of the paste is not too thick and not too thin. If your oven has side racks, you should remove them before starting cleaning.
Apply the paste to the inside of the oven. For best results, clean while the oven is still warm. This can be done immediately after cooking or by preheating the oven slightly before applying the paste. Avoid getting the paste in the ventilation holes and on the heating elements.
After applying the paste, close the oven and leave it overnight. In the morning, prepare a spray bottle filled with vinegar and spray the inside of the oven. Wait five minutes for the vinegar to react with the baking soda, which will help soften the dirt. Then use a stiff sponge to clean the oven walls. All traces of grease, carbon deposits and dirt will be easily removed.
After that, it is important to thoroughly rinse off the soda residue. Use a soft cloth that should be rinsed regularly under running water.
You can also clean your microwave without using chemicals. To do this, pour warm water into a plate, add one tablespoon of baking soda, and mix thoroughly. Place the plate with the solution in the microwave and turn it on at maximum power for 10 minutes. After finishing the work, leave the plate inside for another 10 minutes so that the steam softens the dirt.

Then carefully remove the plate (it will be hot) and wipe the inside of the oven with a soft sponge. Any dirt will be easily removed. Finish cleaning by wiping the microwave several times with a damp cloth, then wipe dry.
Also, don't forget to move the microwave from time to time to clean the countertop underneath it, as debris can accumulate there too.