So embarrassing! Clearly, something exploded in there! Here's how I take care of it:
1. Fill a microwave safe glass or bowl about halfway with water and cook it in the microwave for 5 minutes.
2. After the 5 minutes, don't open the microwave for another 5 minutes or so (this lets the steam build up on the walls of the microwave like you see below)
It's that simple! Don't forget to give the outside of the microwave a wipe down too.
Tomorrow we will clean other small kitchen appliances.