What is the extent of the area, which if impurity exceeds it, requires the use of water for the front and back private parts?

The accepted limit for the obligation of washing the excretions with water is when they exceed the usual place, such as when the excretion spreads onto some part of the buttocks or extends to the glans in an unusual manner, in which case nothing but water will suffice. The Malikis have defined its limit as that which goes beyond the soft part of the anus and two-thirds of the penis.