Is it obligatory to wash vaginal discharge and what follows, such as the expulsion of gas from the front, or should this discharge be left to avoid the expulsion of gas?

There is no harm in not washing the discharge that comes out of the front private part, as it is pure according to the preponderant opinion. Washing it is preferable to avoid disagreement. Wait until the gas discharge stops, then perform ablution for prayer. If there is enough time, wash the discharge to avoid the disagreement of those who consider it impure. Otherwise, there is no harm in leaving it, and do not pay attention to whispers [of doubt].