he began with his private area, coating it with hair removing chemical. And his wife would do the remainder of his body.  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا اطَّلَى بَدَأَ بِعَوْرَتِهِ فَطَلاَهَا بِالنُّورَةِ وَسَائِرَ جَسَدِهِ أَهْلُهُ  

"the Prophet ﷺ would coat (with hair removing chemical) and remove the pubic hairs with his hand."  

أَنَّ النَّبِيَّ اطَّلَى وَوَلِيَ عَانَتَهُ بِيَدِهِ