I have discovered a simple trick to boost the performance of your shampoo. Simply squirt your shampoo into the palm of your hand and add about a teaspoon of baking soda to it. Then message the shampoo into your hair and scalp, rinse, then condition and rinse. The baking soda will give your hair a deep cleaning, make it soft and shiny, boost your hair colour, and remove product buildup. If you have hard water you will notice a significant improvement in the performance of your shampoo if you add the baking soda!