What is the ruling regarding the involuntary clear discharge that women experience, in terms of nullifying ablution or changing clothes for prayer?

Vaginal discharge is of two types: one that exits from the urinary opening, which is impure (najis), and one that exits from the uterus (vaginal discharge). Scholars differ on the ruling concerning vaginal discharge. The Hanafis, Hanbalis, and some Shafi'is hold it to be pure (tahir), citing the hadith of Aisha regarding scrubbing semen from the Prophet’s garment, and that semen mixes with the moisture of a woman’s private parts. In contrast, the Malikis, Shafi'is, and some Hanbalis consider it impure, arguing that the default ruling for anything exiting the two private parts is impurity.

It appears that the most cautious approach is to adopt the latter opinion. Therefore, it is obligatory to wash whatever part of the body or clothing this discharge has touched. As for ablution (wudu'), it is invalidated by its exit, even according to those who do not consider it impure. If it is continuous, it has specific rulings.