Faraaidh of wudhu

Q: While taking a shower, will the wudhu be done or is it compulsory to do the wudhu separarely?

Q: Is it necessary to wash the area between the sideburns and ears in wudhu?

Q: A person did not wash a part of his body properly in wudhu, or forgot to wash a part completely. He finds this out after he has completed his wudhu and dried himself. Can he just wash that part again to make his wudhu valid or does he have to repeat his wudhu?

Q: Is a small amount of waterproof substance excused in wudhu?

Q: From birth I have a congenital hip dislocation problem due which I am not able to lift my leg till the height of the wash basin. In most offices, people wash their feet in the wash basins but I can't do that to wash my feet.

Please advice if I can:

1. Do masah on my feet.

2. Wet the complete foot by rolling a wet hand.

3. Use a commode to wash my feet where a Muslim shower is available.

Q: During wudhu, if a person forgets to wash a limb and only remembers after washing another limb, what should he do?

Q: A patient is admitted to hospital but not in a serious condition and is mobile. However the patient is given a drip and plaster is used to cover the drip. What is the rule regarding wudhu?

Q: When doing masah in wudhu, should masah be done on the full head (no part should be left out) or part of the head? 

Q: Is the glue used in a plaster waterproof? If I remove the plaster, and after doing wudhu, perform several salaahs, and then find out that the glue is still on my limb, are my salaahs valid or should I repeat them?

Q: If I find some surma in the corner of my eye and it is like one particle which is smaller than sand, do I have to repeat my wudu?