وَعَن عَلِيٍّ
قَالَ: سَأَلَتْ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: مَنْ الْمَذْيِ فَقَالَ: «مِنَ الْمَذْيِ الْوُضُوءُ وَمِنَ الْمَنِيِّ الْغسْل»
I asked the Prophet (sallallahu alayhi wa sallam) about prostatic fluid and he replied, “For prostatic fluid ablution is necessary, but for seminal emission washing.”
Mishkat al-Masabih 293, Book 4, Purification, Hadith 29. 1 min read