The bumble and bumble sunday shampoo is a weekly detox shampoo for brighter clearer hair there are plenty of things that can inhibit shine from excessive use of product to hard water and pollutants make a date with this shampoo once a week to remove the residue that dulls natural shine and make the most of your other shampooing sessions throughout the week this one isnt limited to sunday you can use it any day of the week for intensely clarified hair massage into wet hair and rinse