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'.'" (ES)
English reference (ES): Vol. 1, Book 1, Hadith 155 (ES)
Arabic reference (ES): Book 1, Hadith 156 (ES)