The shampoo bars take a long time to clean because it doesn't make suds easily. You have to constantly rub it in a wet hair to make suds, thereby unrooting some hair. Too much rubbing of shampoo bars causes friction and dryness on hair as well as unrooting of hair during bath time. Also, it may not fit those who want to take a quick bath since the bar takes a long time to clean, make a bubble and penetrate easily into the hair. The bar is hard and matipid because it doesn't dissolve/melt easily ...