The most effective way of cleaning the microwave is done by taking a measuring cup full of water in it and turn the microwave on for about 2 minutes. The moisture makes it easy to wipe off the food.
Another easy way of cleaning your microwave oven is taking the essence of 1 lemon and adding 200 ml of water with it. Keep this mixture inside and run the oven for 5 minutes, then mop up the steam inside with a soft cloth. Your microwave will sparkle.