Whenever the Messenger of Allah ﷺ performed the ritual bath after major impurity, he would begin by washing his hands. Then he would pour water with his right hand onto his left and wash his private parts. He would then strike the ground with his hand, wipe it, and wash it. After that, he would perform ablution as he did for prayer. Then he would pour water over his head and over the rest of his body. Finally, he would move aside and wash his feet.
أخبرنا محمد بن العلاء قال حدثنا أبو معاوية عن الأعمش عن سالم بن أبي الجعد عن كريب عن ابن عباس
كان رسول الله ﷺ إذا اغتسل من الجنابة يبدأ فيغسل يديه ثم يفرغ بيمينه على شماله فيغسل فرجه ثم يضرب بيده على الأرض ثم يمسحها ثم يغسلها ثم يتوضأ وضوءه للصلاة ثم يفرغ على رأسه وعلى سائر جسده ثم يتنحى فيغسل رجليه