Discharge from the private part

I have a problem with my stool passage. I don't know how to explain it but it gives of fluids without me knowing it also makes my clothes moist. Its such a thin fluid that when it exits I don't even feel it exiting. My inner garment is moist. I don't know how to attain tahaarat with this fluid and how do I perform my salaah. This fluid has a stench of stool because of it exiting from that passage. After istinjaah I dry myself and rub my hand across I still smell that stench.