I stumbled across this website on pinterest, and after looking around a little, found something that made me get up from my computer and do some cleaning. It seemed like such an easy, quick job, that it would be silly to NOT get up and do it. In fact- go do it now! You can get started and then come back and play on your computer for 8 more minutes until it's ready to wipe...
How to Clean Your Microwave
1) Put 1 cup of vinegar in a glass microwaveable bowl and microwave it on high until it's boiling and has covered the walls of the microwave in vinegary condensation. (this takes about 5 minutes in mine)
Let sit 3 minutes.
2) Carefully remove the bowl of vinegar. With a cloth or paper towel, wipe the surfaces clean. If there are some really stuck on messes, use a scrubby suitable for non-stick cookware.
3) clean the turntable in warm soapy dish water. Dry and put back.
4)Wipe down the outside of your microwave with a damp cloth.
Kelly (the blog author) also suggests sprinkling some baking soda down your kitchen sink drain while the vinegar is in the microwave, then you can pour the vinegar down the drain when you're done with it. You end up with a clean microwave AND fresh drains.
My addition would be to just use your rag that is now covered in warm vinegar and wipe down the outside of the microwave as well- I guess if the inside was really bad, you might need a new rag, I just folded my rag in half and used the clean side. I just did mine, and it looks great and was really easy. I used a microfiber rag. I would recommend not trying to breathe when your face is in the microwave, with all that vinegar. :)