The jurists agreed that it is best to wipe the entire head, but they differed as to whether doing so is obligatory or not. The Malikis and Hanbalis are of the view that it is obligatory to wipe the entire head. The Hanafis and Shafi`is are of the view that it is sufficient to wipe part of the head.

The most correct opinion is that touching a woman does not invalidate Wudu at all whether it is with desire or without desire.

To properly wash the face during Wudu, you have to wash it from where the hair of the head grows to the end of the jawbones and the chin in length, and from ear to ear in width.

Rinsing the mouth and nose in Wudu is proven from the actions and words of the Prophet and they are included in washing the face. So if a person omits rinsing the mouth and nose when purifying himself, his purification is not valid, whether he did that deliberately or by mistake.

This is how to wipe the ears in Wudu: The insides of the ears should be wiped with the forefingers, and the outsides with the thumbs. It is not required to follow the cartilage of the ears when wiping.

If there is any barrier such as grease, paint, wax or glue that prevents water reaching the skin, then Wudu is not valid and prayers offered in that case are not valid.

There is nothing in the Hadith to indicate that it is recommended to do Wudu for every Sunnah prayer. The Hadith of Bilal indicates that it is recommended to persist in doing Wudu, and that it is recommended to offer a prayer immediately after doing Wudu.