Whenever the Prophet ﷺ took a bath after Janaba he started by washing his hands and then performed ablution like that for the prayer. After that he would put his fingers in water and move the roots of his hair with them, and then pour three handfuls of water over his head and then pour water all over his body.  

عَنْ عَائِشَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا اغْتَسَلَ مِنَ الْجَنَابَةِ بَدَأَ فَغَسَلَ يَدَيْهِ ثُمَّ يَتَوَضَّأُ كَمَا يَتَوَضَّأُ لِلصَّلاَةِ ثُمَّ يُدْخِلُ أَصَابِعَهُ فِي الْمَاءِ فَيُخَلِّلُ بِهَا أُصُولَ شَعَرِهِ ثُمَّ يَصُبُّ عَلَى رَأْسِهِ ثَلاَثَ غُرَفٍ بِيَدَيْهِ ثُمَّ يُفِيضُ الْمَاءَ عَلَى جِلْدِهِ كُلِّهِ  

I placed water for the bath of the Prophet ﷺ and he poured water with his right hand on his left and washed them. Then he washed his private parts and rubbed his hands on the ground, washed them with water, rinsed his mouth and washed his nose by putting water in it and blowing it out, washed his face and poured water on his head. He withdrew from that place and washed his feet. A piece of cloth (towel) was given to him but he did not use it.  

صَبَبْتُ لِلنَّبِيِّ ﷺ غُسْلاً فَأَفْرَغَ بِيَمِينِهِ عَلَى يَسَارِهِ فَغَسَلَهُمَا ثُمَّ غَسَلَ فَرْجَهُ ثُمَّ قَالَ بِيَدِهِ الأَرْضَ فَمَسَحَهَا بِالتُّرَابِ ثُمَّ غَسَلَهَا ثُمَّ تَمَضْمَضَ وَاسْتَنْشَقَ ثُمَّ غَسَلَ وَجْهَهُ وَأَفَاضَ عَلَى رَأْسِهِ ثُمَّ تَنَحَّى فَغَسَلَ قَدَمَيْهِ ثُمَّ أُتِيَ بِمِنْدِيلٍ فَلَمْ يَنْفُضْ بِهَا  

Whenever the Prophet ﷺ took the bath of Janaba (sexual relation or wet dream) he asked for the Hilab or some other scent. He used to take it in his hand, rub it first over the right side of his head and then over the left and then rub the middle of his head with both hands.  

كَانَ النَّبِيُّ ﷺ إِذَا اغْتَسَلَ مِنَ الْجَنَابَةِ دَعَا بِشَىْءٍ نَحْوَ الْحِلاَبِ فَأَخَذَ بِكَفِّهِ فَبَدَأَ بِشِقِّ رَأْسِهِ الأَيْمَنِ ثُمَّ الأَيْسَرِ فَقَالَ بِهِمَا عَلَى رَأْسِهِ