How Many Times to Wash Wuḍū’ Members
In wuḍū’, it is obligatory to wash face and hands once. It is permissible to wash them again but it is against shar' to wash them for the third time. The criterion to determine the time is intention of the person making wuḍū’, i.e. he may pour water on his face several times intending [all of them] as the first time.

Wuḍū’ by Immersion
Dring wuḍū’ by immersion, one should intend washing the hands for wuḍū’ when bringing them out of water in order to make it possible to use their wuḍū’ water for wiping.

Wiping on the Head
It is based on caution to do wiping on the head with the right hand but it is not necessary to wipe the head in an up-down direction.
 
To Wipe on the Implanted Hair
It suffices to wipe on the implanted hair provided that it is impossible to wipe on the scalp as one cannot remove them or it is unbearably difficult to do so.

Not Knowing How Long to Wipe the Feet
Due to not knowing the rule, if a person was wiping their feet just up to the bony protrusion before the ankle joint, their previous acts are valid but they should wipe their foot up to the unkle from now on.

An Injured Member to Be Wiped
A person who is wounded in those areas involved in wiping in wuḍū’ should do tayammum if he cannot wipe the wound with a wet hand. But if he can put a piece of cloth on the wound and do wiping over it with a wet hand, by caution, in addition to doing tayammum, he should perform wuḍū’ according to the mentioned method.

Wuḍū’ and Oily Skin
The natural oily secretions of the body — that cover the hair and face skin — are not considered a barrier unless it is so much that it would prevent water from reaching the skin and the hair. 

Tattoo, Wuḍū’ and Ghusl
If the tattoo is merely color or it is under the skin and there is nothing on the skin to prevent water from reaching it, then wuḍū’ and ghusl are valid. 

Barriers as Jabīrah in Wuḍū’ and Ghusl
For wuḍū’ and ghusl, if it is unbearably hard to remove a thing which prevents water from reaching the body, the obstacle is considered as a patch [i.e. it suffices to wash/wipe it].

Wuḍū’ before Prayer Time
There is no problem in doing wuḍū’ with the intention of performing the daily obligatory prayer a little while before its time begins.

Being Unable to Keep Wuḍū’
If one cannot keep his wuḍū’ until the end of the prayer, and the renewal of wuḍū’ during the prayer is too difficult, he can pray only one prayer with each wuḍū’. That is, for each prayer the performance of one wuḍū’ is sufficient, though it would become invalid during the prayer. 

Wuḍū’ with Drinking Water in Masjid Al-ḥarām
If one doubts whether or not they allow to use cold drinking water in Masjid Al-ḥarām and its surroundings for wuḍū’, the validity of wuḍū’ is problematic; rather it is invalid.

To Write Sacred Script without Wuḍū’
In order to write the verses of the Holy Qur’an or the Holy names, it is not necessary to have wuḍū’, but to touch them, it is necessary. 

To Touch Sacred Script in Braille
If the Noble Qur’an or the sacred names are written in Braille, then if the raised dots are signs for letters, it is permissible to touch them without wuḍū’. However, if, according to the view of informed people, Braille is considered as a script, it is necessary to observe caution in touching them. 

To Touch "Bismihī Ta'ālā"
The rule of touching the word "Allah" is not applied to touching the phrase "Bismihī Ta'ālā".