Hadith no. 275 is a repeat. Read it here.
Whenever any one of us was Junub, she poured water over her head thrice with both her hands and then rubbed the right side of her head with one hand and rubbed the left side of the head with the other hand.
In the bath of Janaba, it is not compulsory to wash one’s hair properly. All that’s required is to wet the roots of hair and rub them, as described in the Hadith above.
But the bath of Haydh (menstruation) is a bit different. We’ll look at it in detail in Kitaab-ul-Haydh (Book of Menstruation) inshaAllah. :)