Sayyidah Umm Salamah (may Allah be pleased with her) said: I said: O Messenger of Allah! I braid the hair of my head tightly, or she said: Should I undo the locks of my head for (the bath of) menstruation and janabah? He (peace and blessings be upon him) said: "No! It is enough for you to pour three handfuls of water over yourself, and then you will surely be pure."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 856