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)." (FR)
English reference (FR): Vol. 1, Book 1, Hadith 297 (FR)
Arabic reference (FR): Book 1, Hadith 298 (FR)