The most common use for lemon juice is to add a hint of acidity to sweet or savory dishes. It's also useful in several cleaning and deodorizing applications, and it acts as an astringent for the skin.
Use lemon juice on windowsills and doorjambs to keep crawling insects at bay. To loosen up any caked-on food in the microwave, mix juice with water and operate the unit for at least five minutes . Rub lemon juice on aluminum cookware and then buff to make pots and pans look brand new. Because of its high acid content, lemon juice keeps delicate fruits such as avocados and apples from browning. Treat blackheads by rubbing the skin with lemon juice, or mix it with baking soda to make teeth whiter.