According to Ihtiyat Wajib...

According to Ihtiyat Wajib, one must wipe upto the joint – meaning that point where the foot bends as well. Issue 64: While performing the wiping on the head or feet, the hand itself must be drawn. Therefore, if the hand is kept stationary and the head or feet are moved, then the Wudhu will become void, but if the head or feet move slightly while the hand is being drawn for wiping, then it is not a problem.

Issue 65: If there remains no moisture on the hand to perform the wiping, one is not allowed to get water from another source to make it wet; rather, one must make the hand wet from another part of the body that Wudhu was performed on. For example one can take some of the moisture that is on the face, and perform the wiping with that. Issue 66: The moisture on the hand must be a sufficient amount to leave an effect on the head or feet.

Issue 67: The place of wiping – the head or the feet - must be dry. Therefore, if the place of wiping is wet, it must be dried (before being wiped); but if the wetness is very little such that it does not affect the moisture on the hand, then it is not a problem. Issue 68: There must not be any barrier like a Hijab or hat, or socks or shoes between the hand and the head, no matter how thin they be, even if the water still manages to reach the skin (except if one is helpless).

Issue 69: The place of wiping must be Tahir, so if there is a najasat present, and one is not able to remove it, then one must perform Tayammum. Conditions for Wudhu Issue 70: If the following conditions are present, then the Wudhu will be correct, and if even one of them is not present, then the Wudhu will become void. The water for Wudhu must be tahir (not Najis).

The water for Wudhu, and the place where one is getting the water from must both be Mubah (permissible for use) - meaning that it is not stolen property. The water for Wudhu must be Mutlaq (pure) - not mixed water. The container holding the water must be Mubah (With the conditions that will be explained later). The container holding the water must not be made of gold or silver (With the conditions that will be explained later).

The parts of the body (that are to be wiped or washed at the time of Wudhu) must be Tahir. There must be no obstruction on the body that prevents the water from reaching the body. The Wudhu must be done with the intention of “seeking nearness to Allah”, and not for showing off. Succession (Tarteeb) in actions must be observed (as will be explained later).