Thanks for the tip - not that I use my oven much, but you never know!
I do use the microwave & have found that the easiest way to clean it is this - get out my biggest measuring cup, fill it about 3/4 full with water. Then cut up a lemon - into 4 pieces works fine - & put it in the water. Stick it into the microwave & set it for 5-7 minutes, so it gets good & steamy inside. I let it sit in there until it all cools off, then just wipe it out! Nice & shiny & smells good too!