My post yesterday about cleaning brass with lemon juice reminded me that I've never shared what else I love to do with citrus juice: clean my microwave.
I prefer to use a fresh lemon or orange if I haven't got lemons. I slice it in half, and either wrap it in a wet paper towel or put it in a bowl of water (both give pretty similar results.) Then I microwave it for 3-4 minutes and then let it sit for another 1-2. The microwave gets really steamy and then I'm able to wipe it out with a cloth and it easily lifts away any food that may have been stuck inside. And the microwave is left smelling super good because of the citrus.
If I don't have any fresh citrus I just pour a small amount of lemon juice into a bowl and microwave it. It does the same thing, filling the microwave with steam that makes it easy to wipe clean, and leaving behind a super fresh lemony scent.