What is the ruling on "vaginal discharge"(without lust) ?

Is it considered Najis?If the dress get wet/moist due to vaginal discharge,should the woman have to clean the cloth for Salat?
If vaginal discharge happen throughout the day,should the woman have to do wudu every time? Meaning, does it break the wudu?
What if it happen during the time of salat,will the salat be valid?

This kind of moisture is pak and no ghusl or wudhu required