Is a piece of clothing on which traces of prostatic fluid (madhy) and semen were found considered impure after being washed without rubbing the area of impurity? What is the ruling on its mixing with other pure clothes? Does impurity transfer to them? What is the ruling on the prayer of one who prayed in it? Is it obligatory to repeat the prayer and purify all clothes?

Semen is pure, and it is recommended to wash it. As for pre-seminal fluid (madhy), it is impure. If it gets on clothes, it must be washed. If its trace remains after washing, it must be removed, and the spot washed again. If impure clothes come into contact with other wet clothes, the impurity may transfer to them. If you are certain that the impurity transferred and you prayed with those clothes, knowing about it, then you must repeat the prayer. However, if you were ignorant of it, then, according to the more preponderant opinion, you do not have to repeat it. If wet impure clothing mixes with pure clothing and it is not possible to determine what it mixed with, then all the clothes must be purified for prayer.