'Aishah narrated concerning the Ghusl of the Prophet ﷺ from Janabah, that he used to wash his hands and perform Wudu', then he would run (his fingers) through his (hair on his) head so that it reaches all of his hair, then he would pour water over his entire body.  

عَنْ غُسْلِ النَّبِيِّ ﷺ مِنَ الْجَنَابَةِ أَنَّهُ كَانَ يَغْسِلُ يَدَيْهِ وَيَتَوَضَّأُ وَيُخَلِّلُ رَأْسَهُ حَتَّى يَصِلَ إِلَى شَعْرِهِ ثُمَّ يُفْرِغُ عَلَى سَائِرِ جَسَدِهِ  

It was narrated from 'Aishah that the Messenger of Allah ﷺ used to soak his head, then he would pour water over it three times.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُشَرِّبُ رَأْسَهُ ثُمَّ يَحْثِي عَلَيْهِ ثَلاَثًا