Tahaarat

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: What is shahwat in men that makes ghusl waajib? If only erection and ejaculation occurs when one was asleep but he does not remember any pleasure or excitement, does ghusl become waajib on him?

Q: If a person has more than the excused amount of najasat on their clothes, and the person has very little water available - should they remove the najasat with the water and pray with taymmaum or leave the najsaat on the clothes and use the water for wudu and pray?

Q: If مذی or منى emerges from men whithout shahwat (desire), does ghusl become waajib?

Q: If a woman who always suffers from vaginal discharge which is continuous throughout the day and night. Sometimes the discharge has a foul odor and it is thick white like leucorrhoea and sometimes the white discharge has mild odour or no odour.

After waking up, if she finds the white discharge with a foul odour and she is certain that she did not have a wet dream, does ghusl become compulsory?

Note: She is very certain that she didn't have any wet dream.

Q: Is there any niyyat specially for ghusl. I hear people say things like:

Niyyah for Ghusl Bath after having sexual intercourse. "Nawaithu an’ahthasila huslan minal’janaabathi wathahaarathan lil’badni waa’sthibaahathan lis’salaathi ashhadu’anlaahilaaha il’lal’lahu wa’ashadu an’na’muhammadar’rasoolul’lahi.

If I just say that I am taking ghusl to clean myself from janabat, is this okay or doI have to recite the above?

Q: My little brother usually plays in a small tub of water. He was wearing swimming shorts and went to urinate, he didn’t do istinja (he usually doesn’t do it after urination and defecation). Afterwards he came back and sat in the same tub of water. Does the water become impure? I don’t think the smell color and taste of water changed after that.

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: Are slugs najis? I find a lot of them inside and outside my home and their slime is difficult to avoid.

Q: If I already have wudhu, will I be rewarded for making another wudhu?