In order to clean the microwave using this method, you have to half fill a microwave-safe glass with cold water. Once you have done that, add one tablespoon of vinegar to the water and allow it to settle down.
Place the glass inside the microwave and turn it on for five minutes. You can reduce the time to three minutes, if your microwave is powerful. In order to see if the process is working fine, check whether there is steam building up inside.
Remove the glass container now and wipe down the walls with a kitchen paper towel. All of the gunk will come off pretty easily, as it would have become soft. Afterwards, wash the microwave glass tray like a normal dish and allow it to dry. If you need to use it immediately, wipe it off with the help of a towel.
Take one lemon and slice it in two pieces. Place the halves in a plate with their cut side downwards. Afterwards, add one tablespoon water in the plate and place it in the microwave. Turn it on for one minute, as that will be enough to heat up the lemon. Moreover, you will see that there is a lot of steam inside the microwave.
Just like the vinegar method, you have to wipe the walls of the microwave with the help of a kitchen paper towel.
Dish soap method
The final method is using dish washing soap. Take a glass bowl and half fill it with water. Now, you need to add some soap in it and just like the previous two methods, repeat the same process by turning the microwave on. However, you have to use a sponge instead of a paper towel.