"When AlIah's Messenger wanted to perform Ghusl for Janabah, he would begin by washing his hands before putting them into the vessel. Then he would wash his private area, and perform the Wudu (as one does) for Salat. Then he would wet his hair with the water, then he would pour water over his head with his hands three times."  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا أَرَادَ أَنْ يَغْتَسِلَ مِنَ الْجَنَابَةِ بَدَأَ فَغَسَلَ يَدَيْهِ قَبْلَ أَنْ يُدْخِلَهُمَا الإِنَاءَ ثُمَّ غَسَلَ فَرْجَهُ وَيَتَوَضَّأُ وُضُوءَهُ لِلصَّلاَةِ ثُمَّ يُشَرِّبُ شَعْرَهُ الْمَاءَ ثُمَّ يَحْثِي عَلَى رَأْسِهِ ثَلاَثَ حَثَيَاتٍ  

[Machine] The prophet ﷺ used to perform ablution when he wanted to perform a ritual bath from major impurity. His ablution was for prayer. Then he would put his hand into a container and search through the roots of his hair. When he thought that he had thoroughly reached all of the skin, he would pour water on his head three times. After that, he would perform the ritual bath. Uruwah said, except that he used to start with washing his hands, then his private parts.  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يَتَوَضَّأُ إِذَا أَرَادَ أَنْ يَغْتَسِلَ مِنَ الْجَنَابَةِ وُضُوءَهُ لِلصَّلَاةِ ثُمَّ يُدْخِلُ يَدَهُ فِي الْإِنَاءِ فَيَتَتَبَّعُ أُصُولَ شَعَرِهِ فَإِذَا ظَنَّ أَنْ قَدِ اسْتَبْرَأَ الْبَشَرَةَ كُلَّهَا أَفْرَغَ عَلَى رَأْسِهِ ثَلَاثًا ثُمَّ يَغْتَسِلُ وقَالَ عُرْوَةُ غَيْرَ أَنَّهُ يَبْدَأُ فَيَغْسِلُ يَدَهُ ثُمَّ فَرْجَهُ