Faraaidh and Sunnats of ghusal

Q: Do you have to gargle in fard ghusl or can you just move water around in your mouth like in wuduh?

Q: If a person did not know the fardhs of ghusl for years and would just take a shower when needed ghusl, and he may have gargled mouth and blew nose in the shower but don't know 100%, will the salaah, saum etc of all these years have to be repeated?

Q: I soaped my whole body and rinsed. Is my fard ghusl done?

Q: I am suffering from so much waswasas. I can't handle it I think I am always napaak. When I perform ghusl after I think I having done it right I don't know if all the hairs have got wet on the body. Could you explain to me a way that you would do it so every hair on the body gets wet so the ghusl counts because I think all my salaahs are not getting counted as well and this is really getting to me. It's on my head 24 hours a day I keep having a shower like 3/2 times a day because I think every time I do ghusl its not correct. I need your help

Q: Is it O.K to wash the feet while standing upright during wudhu without using hands to make khilaal between each toe, because I am over weight. I just thoughrally wash my feet by spreading my toes fingers while standind, I do that only when I sit at the masjid Wudhu Khana. While at home I make the wudu in a standing position, because of the over weight, it's hard for me to sit in the bath tub to wash my feet using fingers. Please Advise me for this.

Q: I don't know if all the hairs on my back got wet in ghusl and also I soaped the flat bit under the private parts and the arm pits. Would the rest of the hairs on the body get wet on there own under the shower? I see hair standing up, would they be washed?

Q: I think in the time of the prophet (Sallallahu Alayhi Wasallam) there were no soap so now after a wet dream should we need soap to wash clothes and body?

Q: I was told me that we cannot bleach our face because it coats our skin and ghusl will not be done. Is this true?

Q: After mani comes out, do you have to pass urine before ghusl?

Q: Does a few miniscule grains of iron dust (grains are less that 0,5mm) affect the validity of the ghusl or wudhu? Such grains are mostly on ironware like housekeys or after doing some ironwork a few stay on the hands even after washing. You can notice them best if you hold your hands against the sunshine then you see them blinking. Few days after ghusl I notiticed few such miniscule iron grains, you can hardly notice them unless light falls on them so that they blink. The grains are less than 0,5 mm. Seems to me that they are kind of unavoidable especially when walking barefeet on floors etc.