Faraaidh and Sunnats of ghusal

Q: I would like to find out if my ghusal and wudhu would be valid if I have oil in my hair and on my scalp?

Q: If after I washed everything in ghusl, before I washed my feet, I momentarily stopped to dry my hair and body. This was for a few seconds and I don’t think I completely dried my hair and body with the towel because I was afraid of invalidating my ghusl. Then afterwards I washed my feet. Is my ghusl valid?

Q: Is it permissible to wrap the hair in a towel and place it on the head when it is wet?

Q: I performed fard ghusl. I performed the two fard of washing my whole body and putting water in my nose but before I rinsed my mouth, I drank a glass of water (to fulfill the obligation of gargling, as I was advised to drink a glass of water to fulfill the gargling) but then I forgot about rinsing my mouth. I rinsed my mouth the next day when I remembered but did not gargle as I had already drank water the day before it to suffice for gargling. So is the fard of washing the mouth now complete and my ghusl valid? 

Q: I would like to know that after I made ghusl I realized that there was still some wax on my hand. Do I have to repeat the ghusl or just wash that portion of my hand?

Q: I had taken ghusl and washed my whole body, but I forgot to do wudhu and offered jumuah salaah. Is the ghusl sufficient for wudhu or will I have to repeat my prayer?

Q: Girl has been baaligh for about 5 years. She remembers being particular about doing ghusls from her menstruation but now shes getting doubts that sometimes she might have got yellow discharge in her menstruation days in the first few years and she didnt do ghusl again because she used to get yellow discharge in her paaki days (as white discharge when drying up can turn yellow) but now shes getting doubts and she used to have a bath eveyday (like washing her whole body) but cant remember if every time if she washed her nose and gargled so now how much qadha namaz should she pray coz her ghusl might be done at the wrong time.

Q: I met up in an accident 3 days ago. My leg is injured and has a cast on it. One night I had a wet dream so now ghusal is compulsory on me. How do I take ghusal and pray salaah?

Q: My wife has dyed her hair on my wish. She is advised not to wash her hair for 3 days (she can do masah). How can she do Ghusal if needed? Can she do masah of her head while she washes her whole body during Ghusal?

Q: Is niyyah for ghusl sunnah?