I did this tonight and it worked well. It didn't get everything off, but my microwave is 8 years old and I haven't cleaned it nearly as much as I should over the years so there is some staining and discoloration. All of the particles and food or liquid came right off though! 1 c vinegar + 1 c hot water + 10 min microwave = steam clean! Totally works. No more scum, no funky smells.
tips for getting that musty smell out of the front loading washer....
DIY: Baby Food
Cake Stands... spray paint in the color of your choice - Brilliant!