Woman doing wudoo’ because of ongoing discharge
Question

                My brothers in Islam, I am faced with a difficult problem concerning tahaarah (purity). I read some of your answers but I did not find what I am looking for. Sometimes – not all the time – I experience a yellowish or whitish discharge. According to what I have read, this breaks wudoo’ and I have to do wudoo’ when the time for prayer comes. But often I do wudoo’ before the time for prayer comes if I know that it will be difficult to do wudoo’ in the place where I will be going. Is my wudoo’ counted as valid, and what should I do about the prayers I have offered in these circumstances if my wudoo’ was not valid? May Allaah reward you with good.
Praise be to Allah. 
          Whoever has an ongoing problem that breaks 
          wudoo’, such as incontinence, istihaadah (non-menstrual vaginal bleeding), 
          etc., has to do wudoo’ for each prayer, and put something over his private 
          parts that will prevent the impurity spreading further to affect other 
          parts of his body or clothing. When he purifies himself he does so for 
          a purpose, so that is not done before the time of prayer. So he has 
          to pay attention to that, and fear Allaah as much as he can, for He 
          has not made any hardship in religion. With regard to the prayers you 
          did previously, what was done in ignorance is valid and will be rewarded 
          in sha Allaah, so there is no need to repeat it.