Sayyidah Umm Salamah (may Allah be pleased with her) narrates: I used to scrape semen off the clothing of the Prophet (peace and blessings be upon him).
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Abu Bakr al-Hudhali, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1533