Why is shampoo called shampoo?

The etymology of shampoo is the Hindi Word "campo" (or "champo") and it means to "press, pound and knead," like you do to bread dough. Originally a shampoo wasn't a hair cleaning exercise, but a forceful full-body massage, not restricted to the head, but encompassing the torso and limbs as well, as part of a Turkish bath routine. he final stage of the routine involved one's hair being washed. The first instance of the Word "shampoo" being used in print was in 1862 when a writer mentioned his/her concern that "Had I not seen several China merchants shampooed before me, I should have been apprehensive of danger".