Hawzah News Agency – If some fluid is discharged by a man who is not sick and that fluid has one of the three characteristics (it is accompanied by lust, it comes out with a gush, and one’s body feels weak after it has come out), but the man does not know whether or not it had any of the other characteristics, [he will not be junub and] in the event that he had wuḍūʾ before the discharge of the fluid, that wuḍūʾ remains valid. And if he did not have wuḍūʾ, he only needs to perform wuḍūʾ [when required], and performing ghusl is not obligatory on him.

Source: https://www.sistani.org/english/book/48/