How to remove cooking odours from the inside of a microwave oven.

Combine 1 to 1 ½ half cups (250 to 375 ml) of water with the juice and peel of one lemon in a 2 quart (1.9 l) microwave safe bowl.
Set power to HIGH for 5 minutes and press [START].
Once the water finishes boiling, wipe the interior of the oven with a cloth.