Tahaarat

Q: I ride scooters and bikes to school. I rolled over non-halal foods/sandwich packages with leftover foods several times when riding on the streets. I live in the U.S. and the sandwiches are subway wraps with wet food oil and sauce and certainly not halal. Hence, the bike tire becomes impure. When I ride it in rainy days, the water splashes from the tire onto my shoes and pants. Since the bike tire is impure the water splash is impure. I have to go back home and wash them every time I pray and it severely impacts my life. However, I heard that walking or rubbing impurity against the ground makes the impure shoe pure. Does this ruling apply to a bike/scooter tires? If so then the bike tire can be regarded as pure as it rubs against the ground so many times?

Q: Will masah of the head be valid when hair spray is used on the hair?

Q: There is a hadith that if one gets up from his sleep, he must not put his hands into a vessel before washing them because one doesn't know where his hands were when he was sleeping. So do my hands become impure after I get up from my sleep? 

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.