To use your Shampoo Bar, simply wet your hair, then rub the bar over the hair a few times. Work in to a lather, then rinse. Follow with conditioner as needed. For best results, allow the Shampoo Bar to dry completely between uses – a draining soap dish is best. Bars left in water will not last as long as if they are left to dry. One Shampoo Bar can last up to as long as 2 to 3 average sized bottles of shampoo – results may vary depending on hair length, how hard or soft your water is & if it is left to dry completely between uses.