These discharges and secretions that women experience are described by the scholars as moisture of the private part. They are light secretions that a woman may not feel, and women vary in the amount of discharge.
The most correct view is that they are taahir (pure), because there is no evidence to indicate that this moisture is najis (impure).
Based on that, it is not required to wash off whatever of that discharge gets onto the body or clothes.
See the answer to question no. 44980
With regard to the ruling on whether it invalidates wudoo':
Ibn Hazm (may Allah have mercy on him) was of the view that this moisture does not invalidate wudoo'.
However the majority are of the view that they do invalidate wudoo', unless they are continual, in which case she should do wudoo' for each prayer when the time for it begins, then it will not matter if there is any secretion of moisture after that. The ruling on the woman who experiences that is the same as the ruling on those who have excuses, such as one who is suffering urinary incontinence or istihaadah (irregular, non-menstrual vaginal bleeding) and the like.
Some of the scholars are of the view that the one who is affected by ongoing invalidation of wudoo' is not required to do wudoo' for each prayer, unless it is invalidated by something other than the issue that is ongoing in his case. Apart from that, it is mustahabb for him to do wudoo' but it is not obligatory for him. Ibn Abd al-Barr said: Wudoo' in this case, according to Maalik, is mustahabb (encouraged) but not obligatory.
He said: Among those who said that wudoo' is not obligatory for the woman who is suffering istihaadah were: Rabeeah, Ikrimah, Maalik, Ayyoob and a number of others.
See: at-Tamheed, 16/98; Fath al-Baari by Ibn Rajab, 2/73
This view is the one that Shaykh Ibn Uthaymeen (may Allah have mercy on him) settled on.
See: ash-Sharh al-Mumti ala Zaad al-Mustaqni, 1/503
Even if we assume that it does invalidate wudoo', according to some scholars, if you were unaware that these discharges invalidate wudoo' and you offered a number of prayers with one wudoo', you do not have to repeat what is past, according to the more correct opinion, because you are excused, as you did not know.
See also the answer to question no. 102504
But in the future, it is better for you to do wudoo' for each prayer, so as to avoid an area where there is a difference of scholarly opinion. One should try to be on the safe side in such cases, because according to the view that wudoo' is required, acts of worship are rendered invalid if that is not done. Even those scholars who did not say that it is obligatory stated that it is mustahabb (encouraged).
And Allah knows best.
Reproduced from Islam QA