(64) باب غَسْلِ الْمَنِيِّ وَفَرْكِهِ وَغَسْلِ مَا يُصِيبُ مِنَ الْمَرْأَةِ
Narrated `Aisha:
I used to wash the traces of Janaba (semen) from the clothes of the Prophet (ﷺ) and he used to go for prayers while traces of water were still on it (water spots were still visible).
Reference: Sahih al-Bukhari 229
In-book reference: Book 4, Hadith 96
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 4, Hadith 229