If you need to clean gunk out of your microwave, heat a bowl of water for 2-3 minutes before you get started. The steam will loosen the gunk so you can just wipe it away quickly. You may not even have to use any cleaning spray.
How’s that for green cleaning?
I think I read that in Real Simple once, and it has turned a 15-minute scrub-a-thon into a super easy clean. They also suggested putting a lemon slice in the bowl of water to give it a fresh, lemony smell.