All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
The opinion we adopt here at Islamweb, and it is also the view of the majority of the scholars, is that these vaginal discharges invalidate the ablution, even though they are ritually pure and do not require Istinjaa’ (cleaning the private parts with water).
There is no hardship involved in following this opinion; all praise be to Allah. If a woman knows that such discharges cease for a known period of time that is sufficient for her to perform ablution and pray, then she must wait for that time to perform the respective prayer. If there is no known time for their cessation, as in the case that they are continuous, or the duration and time of their cessation are irregular; like when sometimes their duration is long, and sometimes it is short, and sometimes their cessation is early, and at others, it is somewhat delayed, then the ruling on a person suffering from incontinence applies to her in this case. Accordingly, she is required to perform ablution for each obligatory prayer after the start of its due time and then perform the obligatory prayer and voluntary ones as she wishes with this ablution until the time of the respective prayer ends. If following this opinion involves hardship and inconvenience for her, she may follow the opinion of the Maaliki scholars, who held that an incessant (continuous) Hadath (state of ritual impurity) does not invalidate the ablution.
Allah Knows best.