You're more likely to see ammonium laureth sulfate or sodium lauryl sulfate on the ingredients list of your shampoo and conditioner than lizards in olive oil, but you aren't a 12-century European [source: Scott].
The Egyptian hair-washing preparations of 2000 B.C. contained citrus juices, animal fats and plant oils. The acidic juice was for cleansing, while the fats and oils followed to coat the hair and keep it smooth. Hair complaints aren't a thing of the Cosmopolitan magazine era -- people have been complaining about oiliness vs. frizz for as long as recorded history.
A New York Times writer wrote in 1909, "The wet shampoo is exhausting in itself" and went on to describe a Parisian alternative: "cleaning" the hair with gas fumes [source: NYT].