It was narrated that 'Aishah said:
"I used to scrape the Janabah." On another occasion she said: "The semen from the garment of the Messenger of Allah (ﷺ)." (IT)
English reference (IT): Vol. 1, Book 1, Hadith 297 (IT)
Arabic reference (IT): Book 1, Hadith 298 (IT)