This is a very simple mixture, and the fact that it is all natural makes it healthier for your hair, rather than using dyes.
You have to combine lemon juice and water, mixing a cup of freshly squeezed lemon with one-quarter cup of warm water. Add a cup of orange juice and fill the mixture in a spray bottle. If you have dry hair, you can add conditioner as well, because the mixtures has a drying effect on the hair.
Protect the skin on your face with sunscreen, because you will be using the power of the sun.
Afterwards apply the mixture to your hair by spraying it all over. You can add highlights, if you desire to, by soaking a cotton ball in the lemon lightener and sliding it down your strands.
Find a nice place outside, where the sun is shining, and stay there for an hour. Afterwards, reapply the mixture again after about 90 minutes and go out in the sun again, for half an hour.
When you are done lightening, wash your hair with a generou amount of conditioner. Give it some time to work, it will come to a change in a few weeks.