Reports on semen

Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: The Prophet (peace and blessings be upon him) was asked about semen that gets on clothing. He said: "It is like phlegm and spittle. Wipe it off with a piece of cloth or with grass."
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Muhammad bin Ubaydullah al-Arzami, on whose weakness there is agreement.

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).

Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: We used to wipe it off with grass and wool; he meant semen.
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).