It was narrated that Sahl bin Hunaif said:
"I used to suffer from a great deal of prostatic fluid, and I took many baths because of that. I asked the messenger of Allah about that, and he said: 'Ablution is sufficient for you in this case.' I said: 'O Messenger of Allah! What about the prostatic fluid that gets onto my clothes?' he said: 'it is sufficient for you to pour a handful of water on the part of your clothes wherever you see it has reached.'"
English reference: Vol. 1, Book 1, Hadith 506
Arabic reference: Book 1, Hadith 545