"At a time when the British showed no particular enthusiasm for cleanliness, Indian women for example introduced British men to the delights of regular bathing. The fact that the word shampoo is derived from the Hindi word for massage, and that it entered the English language at this time, shows the novelty to the eighteenth-century British of the Indian idea of cleaning hair with materials other than soap. Those who returned home and continued to bathe and shampoo themselves on a regular basis found themselves scoffed at by their less hygienic compatriots: indeed it was a cliché of the time that the British in Bengal had become ‘effeminate’."
January 1, 1970
https://en.wikiquote.org/wiki/Water_supply_and_sanitation_in_India