The ruling on one who finds a dry trace on his garment after sleeping

Question:
He says: Honorable Shaykh, may Allah grant you success. He says: Sometimes when I wake up from sleep, I find a dry substance on my garment, and I do not know whether it is old or new, or whether it is from me or pre-seminal fluid. Is it obligatory for me to perform the full ritual bath in this case?

Answer:
There is a difference between pre-seminal fluid and semen. Semen has a solid, congealed form, and the garment contracts with it. As for pre-seminal fluid, it is like water; it does not become solid, and the garment does not contract with it. It dries and leaves no trace, unlike semen, which congeals and has a presence on the garment. So there is a difference between the two. The conclusion is that if you find a trace of semen on your garment after sleeping, it is obligatory for you to perform the full ritual bath. Yes, as passed to you in the hadith. Yes.