When the Prophet ﷺ performed the ritual bath after major impurity, he would begin by washing his hands, then perform ablution as he did for prayer. He would then dip his fingers into the water and run them through the roots of his hair, then pour three handfuls of water over his head, and finally let the water flow over his entire body.
حدثنا عبد الله بن يوسف قال أخبرنا مالك عن هشام بن عروة عن أبيه
أن النبي ﷺ كان إذا اغتسل من الجنابة بدأ فغسل يديه ثم يتوضأ كما يتوضأ للصلاة ثم يدخل أصابعه في الماء فيخلل بها أصول شعره ثم يصب على رأسه ثلاث غرف بيديه ثم يفيض الماء على جلده كله