Lemon juice is often used in natural home remedies for oily skin. The citric acid in lemon juice breaks down the oil in your skin and helps to bring your skin back to a neutral PH balance. It can be a bit too strong on its own, so it is best if you mix a teaspoon of lemon juice with a little bit of water and then apply to your face with a cotton wool ball. You can use lemon juice on its own in this way, or you can add it to some the other ingredients listed here to give the treatment some extra potency