What are the white discharges that do not nullify Wudu and Salah, and those that do?

Everything that exits from either of the two private parts (front or back) nullifies ablution, and this includes vaginal discharge. Imam An-Nawawi stated that everything that exits from the front or back private parts, whether feces, urine, wind, pus, or blood, nullifies ablution. These discharges are considered pure according to the more preponderant opinion, so it is not obligatory to purify the body and clothes from them, but they do nullify ablution.