Wudhu

Q: A person made wudhu and performed salaah. Later on, he noticed that there was some dirt stuck under his nail which did not get washed away. Is his wudhu and his salaah valid?

Q: When making wudhu, is it fardh to make masah of any quarter of the head or does it particularly have to be the front of the head?

The reason for enquiring is that if it's fardh to make masah of any quarter, then a woman in pardah will be able to make masah of her head without removing her scarf while traveling.

Q: If a person does not perform a complete wudhu, will his wudhu be valid? If a person performs salaah with such a wudhu, what will be the condition of the salaah?

Q: My face is oily. When I am performing wudhu, some of the oil of my face gets onto my hands. Do I have to rub my hands with water to ensure that water gets underneath the oil and reach my skin?

Do I have to rub any part of my body if the oil of my face gets onto them (for example my forearms, my feet)?

In that same logic, if oil from a part of my face (the left part for example) get onto or mixes with the oil of another part of my face (the right part for example) do I have to rub that area with water (the right part of my face)? 

Q: An old lady has been advised by a doctor to wear compression stockings on her legs for circulation. She doesn't have any wounds etc. on her legs. The stockings are from her knees and only the toes are open.

The stockings are very tight and she requires someone to put it on and remove it for her. Is it permissible for her to make masah over the stockings and only wash the toes for wudhu?

Q: If a person performs wudhu by spraying water using a spray bottle and wiping the required parts without water falling on the ground, will the wudhu be valid? Is there a requirement that water should fall on the ground while washing in wudhu?

Q:

1. When the boundaries of the face are mentioned in the books of Fiqh, are the boundaries included in the washing i.e. is the bottom of the chin included and must be washed?

2. If someone came and said to you, "I can’t see the bottom part of my nose (just above the moustache) so must it be washed? What would you say to him when telling him about the definition of the face?

Q: I was sitting after performing salaah when I noticed that there is a black, sticky substance on my foot through which water could not pass. It was the size of a whole round fingernail, and I had not seen it before.

Then, my brother told me that he saw it since 3 or 4 days on my foot. I had also led jamaat during these days. Will I have to repeat all the salaah that I had offered on these days? Will those who followed me in jamaat also have to repeat their salaah?

Q: If I have treatment done on my face and cannot use water for nine hours, will tayamum suffice?

Q: If I have olive oil in my hair and I make wudhu/ghusl afterwards, is my wudhu/ghusl accepted?