Ever felt like you wash and wash and wash and wash your hair and it still looks just as it did before you started. Well that's product build up. Product build up is when a mixture of different hair products build up on your hair and scalp and don't come out using your normal shampoo. This shampoo solves this problem, I use it at least once a week just to keep my hair extra clean. What I love about it is that you can get the shampoo into a really good lather and only need to use a little amount. Once your hair is dry it looks really clean and shiny and grease free. Everyone needs a bottle of this to hand. I find that TRESemmé deep cleansing shampoo does a similar job too.