Faraaidh and Sunnats of ghusal

Q: I performed farz ghusal. However, after an hour I saw a napaki stain on my leg. It was hard by that time. Will I have to repeat the ghusal?

Q: I brushed my teeth then I did ghusl. After that I felt there was some thing on the side of my tooth. I removed it with my finger and it was a piece of food but it was soft (may be a piece of chicken) on the side of my tooth but attached to the surface. Is my ghusal valid?

Q: I just want to know that during ghusal if we are washing our body parts like, if first we wash our first arm 3 times and then forgetfully we wash our 2nd arm 2 times so is it okay ? Or we have to balance the order?

Q: I live in America and it’s winter now and very cold.

My question is after marital relations with husband at night, is it permissible to wash my whole body but not my hair and do tayaamum for the hair? I have very thick hair and I can’t dry my hair fully even with hair dryer. I get a cold at night after washing hair. Can you please advise?

Q: During ghusl, it is fardh to gargle the mouth. But is it necessary to send water to the back of the mouth by lifting the head and bubbling water from the throat?

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?