Clean a microwave
Microwave 1/4 cup vinegar + 1 cup water in a bowl for around 3 minutes until boiling. Let sit 10 mins. Wipe inside with a damp cloth.
Combine 1/4 cup of vinegar and 1 cup water in a microwavable container. Microwave until the mixture comes to a boil (about 3 minutes), then let it stand in the microwave for 10 mins. Wipe the inside of microwave with a damp cloth.