The microwave can be cleaned with both chemical detergents and natural products: the first category includes special detergents and those for dishes, while the second includes vinegar, lemon and sodium bicarbonate.
If you opt for a specific detergent for proper cleaning, just follow the instructions on the package, while in case of using dish detergent it is necessary to dissolve a quantity in a bowl full of water and place this 'last in the microwave for 5 minutes at maximum temperature.
After the time has elapsed, the container must be removed from the oven (being careful because it is hot) and then the walls can be cleaned with a sponge, while the glass turntable must be removed and washed by hand or in the dishwasher.
Unpleasant odors
To make the burnt smell go away, you can leave a bowl full of bicarbonate in the oven overnight and in the morning clean the walls and turntable with a solution of water and bicarbonate or heat to maximum temperature for 5 minutes a container with water and an orange and a lemon cut in half: in this way the steam eliminates the residues from the walls and the bad smell.
Finally, the same result can be obtained by replacing the orange and lemon with ground coffee or coffee grounds.
