It was narrated from Rafi' bin Khadij that 'Ali told 'Ammar to ask the Messenger of Allah (ﷺ) about prostatic fluid, and he said:
'Let him wash his male member and perform Wudu'.'" (JA)
English reference (JA): Vol. 1, Book 1, Hadith 155 (JA)
Arabic reference (JA): Book 1, Hadith 156 (JA)