There was soup was already a dried on mess and was EVERYWHERE.
When the time is up, the microwave is a steamy lemony smelling mess, which is EXACTLY what you want! I used a Magic Eraser while wearing gloves (because the lemon-water mixture is HOT) and dipped the Magic Eraser in the hot water prior to wiping down the side of the microwave.
I started with the door, then the ceiling, then the back of the microwave before the effects of the steam had worn off. So I added some cool water to the bowl and restarted the microwave for another couple of minutes, then attacked the sides. I washed the tray in the sink and finally cleaned up the floor of the microwave.
Total time? About ten minutes.
Outcome? I can use my microwave again!
What tricks do you use to clean your microwave?