1. Add 1/4 to 1/2 cup of lemon juice to the wash cycle to brighten up those fading whites.
(very useful! Especially on those old clothes..)
2. Relieve a sore throat. Cut a lemon in half. Skewer one half over a medium flame on a gas stove until the peel turns golden brown. Let cool slightly, then mix the juice with 1 teaspoon of honey. Swallow the mixture.
(a natural method of relieving sore throat! why not?)
3. For subtle highlights in blond hair, simmer two sliced lemons in water for one hour (add more water if needed). Strain, then pour into a spray bottle.
(haha, great for people who have colored hair like me!)
4. To remove tough food stains from light wood and plastic cutting boards, slice a lemon in half, squeeze onto the soiled surface, rub, and let sit for 20 minutes before rinsing. The best part? You'll have a house that smells like a lemon grove rather than chemicals.
(not only do this remove stain, it smells nicer too!)
information taken from here