It was narrated from 'Aishah that when the Prophet (ﷺ) performed Ghusl from Janabah he would start by washing his hands, then he would perform Wudu' as for prayer, then he would dip his fingers in the water, then run them through his hair, then he would pour water over his head three times, then he would pour water over his entire body.
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، رضى الله عنها أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ إِذَا اغْتَسَلَ مِنَ الْجَنَابَةِ بَدَأَ فَغَسَلَ يَدَيْهِ ثُمَّ تَوَضَّأَ كَمَا يَتَوَضَّأُ لِلصَّلاَةِ ثُمَّ يُدْخِلُ أَصَابِعَهُ الْمَاءَ فَيُخَلِّلُ بِهَا أُصُولَ شَعْرِهِ ثُمَّ يَصُبُّ عَلَى رَأْسِهِ ثَلاَثَ غُرَفٍ ثُمَّ يُفِيضُ الْمَاءَ عَلَى جَسَدِهِ كُلِّهِ .
sunnah.com