Sunan Ibn Majah, Volume 5, Book 33, Hadith 3752 (DarusSalam) ⓘ
It was narrated from Umm Salamah that: "the Prophet would coat (with hair removing chemical) and remove the pubic hairs with his hand."
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنِي إِسْحَاقُ بْنُ مَنْصُورٍ، عَنْ كَامِلٍ أَبِي الْعَلاَءِ، عَنْ حَبِيبِ بْنِ أَبِي ثَابِتٍ، عَنْ أُمِّ سَلَمَةَ، أَنَّ النَّبِيَّ اطَّلَى وَوَلِيَ عَانَتَهُ بِيَدِهِ .
also referenced under: Hadith 3752 (Reference) & Book 33, Hadith 97 (In-Book)