This is the best and easiest way to clean your microwave!
Place 2 cups of water in a microwavable bowl.
Nuke it for 5 mins on regular setting.
After 5 mins are up, leave the bowl in the microwave for another 2 mins or so to let it steam.
Take out bowl (will still be HOT!) and wipe down the oven....everything slips off so easily, no cleaner needed.