Faraaidh of wudhu

Q: Is wudhu permissible with nail gel on and how can a person know if water reaches to the nail with nail gel on?

Q: If there is some dirt under my nail and I make wudhu not realizing its there and only realize afterwards, will my wudhu have to be redone?

Q: Can you please let me know can I wipe (masah) over normal socks? Not leather one's because im in Kuwait here most of the people do this. If it's not permissible, can I perform namaz behind them or should I perform individually? Please give me a clear answer.

Q: I washed my feet in wudhu and I went to wipe my limbs. At this point I realised I had forgotten to wash my hands so I went back to wash them without repeating the wudhu. Did I act correctly?

Q: Can I perform Salaah if I have a little spray on my nail?

Q: My father is elderly and has difficulty lifting his feet to the sink when performing wudhu. Is it permissible for him to wash them by placing them in a bowl of water? 

Q:

1. After making wudhu, dirt on the cheek remains even after washing the cheek, is the wudhu valid or must the that part of the face be washed again?

2. After making wudhu, sunblock on the face remains even after washing that part of the face, is the wudhu valid?

3. After making wudhu, the dirt (like sand which you normally find when awakening from sleep) remains in the corner of the eye even after washing that part of the face in wudhu, is the wudhu valid?

Q: I know that anything that stops water from entering your skin is haraam (nail polish, wax, etc). But if I only do white nail tips, or any colour nail polish on the tips of my nails which isn't touching the skin. Is this ok!

Q: If we perform Salaah behind an Imam who did not make masah of the neck and did not wash his feet. He only made masah on his ordinary cotton socks.  Will the Salaah of the Imaam be valid and will the Salaah of the muqtadis be valid?

Q: Is the eye mucus permeable when it is soft? It looks impermeable when it is hard.