Shampoo is a hair care product, typically in the form of a viscous liquid, that is used for cleaning hair. Less commonly, shampoo is available in solid bar format. Shampoo is used by applying it to wet hair, massaging the product into the scalp, and then rinsing it out. Some users may follow a shampooing with the use of hair conditioner.
Shampoo lather in hair
Bottles of shampoo and lotions manufactured in the early 20th century by the C.L. Hamilton Co. of Washington, D.C., United States
Swedish advertisement for toiletries, 1905/1906
Typical liquid shampoo
Soap is a salt of a fatty acid used in a variety of cleansing and lubricating products. In a domestic setting, soaps are surfactants usually used for washing, bathing, and other types of housekeeping. In industrial settings, soaps are used as thickeners, components of some lubricants, and precursors to catalysts.
A handmade soap bar
Box for Amigo del Obrero (Worker's Friend) soap from the 20th century, part of the Museo del Objeto del Objeto collection
Marseille soap in blocks of 600 g
Advertising for Dobbins' medicated toilet soap