Is the fluid discharged after the the emission of prostatic fluid (madhy) impure, and is it permissible to pray in clothes that have been dampened by it?

Human sweat is pure in all circumstances. There is no connection between its purity and the emission of madhy (pre-seminal fluid), nor does the emission of madhy affect the ruling on the purity of sweat, whether the emission of madhy was due to a permissible or forbidden cause. Therefore, it is permissible to pray in clothes that have been affected by this sweat. As for purification from madhy, it requires washing the part of the body it touched and sprinkling water on the clothes, but ghusl (full ritual bath) is not obligatory for it.