Faraaidh and Sunnats of ghusal

Q: Will it suffice for a woman whose hair is plaited to wash the roots of the hair or it is necessary to wash all the hairs?

Q: Wanted to ask, recently had keyhole surgery and was in haidh but now need to take a bath to become clean. Because of stitches been told not to get that part of the knee wet. Would running across wet palms across that area suffice for ghusal?

Q: Tap water that comes in my house is not clean. So when I perform ghusal, I don't gargle. Instead, after doing ghusal I gargle with clean water. Is my ghusal valid?

Q: If a mango string is stuck in my teeth, I did my best to clean my teeth before making ghusl mindful that all mango strings are taken out, after ghusl I read salaah and quraan. The next morning I ate thereafter I cleaned my teeth again and I found a small single mango string from my teeth. Is the ghusl, salaah and reading of quraan valid? The mango string is as thin as hair.

Q: In ghusl of janabat water must reach under finger and toe nail? After every ghusl I get different kinds of doubt like water is not reaching in my mustache or anything. What can I can do? I suffer waswasas after every ghusl. I am facing a lot of doubt. In ghusal janaabat, if I forgot washing any part of the body what can I do?

Q: In ghusl I forgot to wash my mouth. After few minutes I got to the bathroom to wash my mouth. Is it enough or should I wash my entire body again?

Q: If I take a bath and clean my nose and mouth in a wudhu way, would it be considered to be wudhu? If so then shall the water reach all parts of my body while bathing? What about ears?

Q:

1. Kindly explain the full method of performing ghusal.

2. Is it Farz/Obligatory for us to make wudhu during Ghusal or not?

Q: I would also like to know. If I showered from head to toe with the intention of performing ghusl but I forgot to say the niyyah. Do I need to make ghusl again or can I perform my salaah without redoing my ghusl?

Q: I know nail polish prevents ghusal but what if I removed the nail polish but due to cracks in my nails nail polish gets stuck and doesn't come off even with a nail polish remover, will the ghusal be valid? The nail polish wasn't coming off so I thought since it wasn't though I tried hard my ghusal would be valid. Later today when I was washing my hands I found out that nail polish of the size of the needle tip was also left on two of my other nails including this one so I removed those dots. Is my ghusal valid? Then afterwards o cut my nails today and scratched the remaining stuck nail polish from the top of my nails first with a nail-filer then with a knife. I had to scratch off the top layer of my thumb nail in order to remove the nail polish. Do I have to redo my ghusal? I should have done the scratching yesterday after ghusal I know, but then I forgot to and only remembered after seeing it today. What should I do? Will everything have to made pure too?