I have blonde hair, and every few days I rinse my hair with lemon juice after shampooing it. I find that it brings out the golden highlights in my hair effortlessly. It also seems to remove build up from hard water, hair spray, and other styling products that can weigh down and discolor blonde hair.
All you have to do to get these benefits from lemon juice is shampoo your hair as you normally do. After you have rinsed it thoroughly, rub fresh lemon juice through it from the roots to the tips. Leave it on your hair for about 5 minutes, then rinse it again thoroughly. After several applications, you will begin to see a difference in your blonde hair, and more vibrant highlights than you ever had before.