Musannaf Ibn Abi Shayba 1:980

Waki’ narrated to us, from Ja’far ibn Burqan and ‘Umar ibn al-Walid al-Shanni, from ‘Ikrimah, who said: Regarding semen (al-mani), prostatic fluid (al-wady), and pre-seminal fluid (al-madhy): As for semen, it requires ghusl (full ritual washing). As for pre-seminal fluid and prostatic fluid, one should wash his private part and perform wudu (ablution).