Is your microwave dirty?

I spent the day cleaning and organizing. A little while ago I found a tip on a blog about cleaning out your microwave. I can't remember which blog it was on but, what you do is take a wet washcloth, put it in the microwave for 1-2 mins. on high,( I did it for 1 min.) when it is done all the crusties are easier to wipe out! Genius! Am I the only one who never knew this awesome trick until now? It works like a charm!