Three of My Fav Lemon Tricks For the Kitchen:
1.) Deodorize Your Garbage Disposal. Next time you use a lemon, save the peel. Drop them down your drain and turn on the disposal ... instant lemon zested disposal. (You can do this with orange peels too!)
2.) Clean Your Microwave: Mix 3tbsp of lemon juice with 1 1/2 cups of water in a microwave safe bowl. Then microwave the mixture on high for 5-10 minutes. This will soften all splattered soup and other things you don't really want to think about, and you can easily wipe it away with a rag.
3.) Make your Dishwasher sparkle: Do you have a packet of lemonade Kool-Aid hanging around the house from last summer? Put it to use! Pour the contents into the soap dispenser in your dishwasher and run through an empty load on a hot cycle. The acidity in the lemonade will combat the high iron content in your water and voila! Your dishwasher will be sparkly white!
Write a secret message with lemon juice. Use a q-tip to and lemon juice to write your message on a piece of white paper. then give it to your secret agent (or secret lover) with the instructions to warm the paper by the heat of a light bulb, the heat will turn your lemon juice message light brown. (Please don't start a fire in your home trying to be a secret agent.)
source: Readers Digest