It was narrated that 'Aishah said:
"The Prophet used to bring his head close to me when I was menstruaring and he was in I'tikaf (seclusion in a mosques for the purpose of worship), and I would wash it and comb his hair." (RU)
English reference (RU): Vol. 1, Book 1, Hadith 633 (RU)
Arabic reference (RU): Book 1, Hadith 676 (RU)