It was narrated that 'Aishah said: "When the Messenger of Allah (ﷺ) performed Ghusl from Janabah, he would wash his hands, then perform Wudu' as for prayer, then he would perform Ghusl, then run his fingers through his hair to be sure that the water pour water over his head three times, then wash the rest of his body."
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، أَنَّهَا قَالَتْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا اغْتَسَلَ مِنَ الْجَنَابَةِ غَسَلَ يَدَيْهِ ثُمَّ تَوَضَّأَ وُضُوءَهُ لِلصَّلاَةِ ثُمَّ اغْتَسَلَ ثُمَّ يُخَلِّلُ بِيَدِهِ شَعْرَهُ حَتَّى إِذَا ظَنَّ أَنَّهُ قَدْ أَرْوَى بَشَرَتَهُ أَفَاضَ عَلَيْهِ الْمَاءَ ثَلاَثَ مَرَّاتٍ ثُمَّ غَسَلَ سَائِرَ جَسَدِهِ .
sunnah.com