There are 4 Fard in Wudu which we must strictly follow. These 4 Fards are:
1. To wash the face – which is from the forehead till the chin and from one ear to the other ear once.
2. To wash both the arms till the elbows once.
3. To make Masah of at least a quarter of the head. By quarter is meant 4 fingers width.
4. To wash the feet till the ankles once.
5. If these 4 actions are not carried out, then the Wudu will be incomplete. It will, therefore, be Haraam for a person to read Salaah.