(65) باب إِذَا غَسَلَ الْجَنَابَةَ أَوْ غَيْرَهَا فَلَمْ يَذْهَبْ أَثَرُهُ
Narrated `Aishah:
I used to wash the semen off the clothes of theProphet (ﷺ) and even then I used to noticeone or more spots on them.
Reference: Sahih al-Bukhari 232
In-book reference: Book 4, Hadith 99
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 4, Hadith 232