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