"Here's What Can Happen When A Soggy Stump Goes Through A Hard Freeze: Ice Fur! This Is A Thick Coat Of Fine, Delicate Ice Crystals"
I'm absolutely adding that to my list of things to do when I'm getting rid of a microwave... (so far a CD has been my favourite)
should try lightbulbs too!
look it up on YouTube it is surprisingly simple but DEFINITLY kill your microwave
Reverse vacuumed?