Impurities on clothing and furniture

Q: If I make a tile napaak as a piece of clothing with urine on it has touched it, if I do wudhu and my wet feet touches the tile, if my foot doesn't smell of urine nor does it turn yellow is my foot considered paak or napaak?

Q: Whilst I was urinating, I felt as though a drop may have touched my leg as I thought I felt it. The question I have is that I am unsure if there was urine on my trousers and I assumed they were clean and prayed my Salaah. Was my Salaah valid, and also, if a scenario like this occurred in future where I am unsure, should I assume that my clothes are clean or my clothes are dirty?

Q: If a person has sperm on his underpants and trouser and does not wash it separately but just puts it in the washing machine as I know the washing machine washes three times, does the other clothes become impure?

Q: If one has doubts about whether there is semen on ones clothes or not, for example, he is wearing a shirt which may have had, but he is unsure, some semen on it, and that shirt touched clean trousers that he was going to wear after doing ghusl, must he then clean the trousers?

Q: A year back something impure like alcohol fell on my slippers when I went to some place. Now I don't remember whether after coming back I washed it or not or later I washed it. I don't remember whether I kept the slipper unwashed or washed in my cupboard. Though after that I have washed it a lot of times but I can't remember whether that time I had washed it and kept it in my cupboard. Now my other shoes were also kept in there with these and I can't seem to remember whether I kept them inside washed or not. Will my other shoes be impure or will the cupboard be impure as the shoes might have touched. I'm feeling very distressed please help.

Q: If someone is in a state of Janabah and when using the toilet, semen falls on the toilet seat, will using the jug to splash water on the toilet seat wash away the semen or should a wet toilet paper be used also to wipe the seat to make sure it's clean?

Q: If someone spills alcohol on shoes and the shoe is leather type material. I have wiped the area with a wet tissue. Will it be clean as the spot still remains on the shoe. If someone will wear the shoe will he be napaak?

Q:

1. If a person is wearing dark coloured underwear, how will he figure out if he had a wet dream and what else are the signs?

2. What is the significants of reading Surah wasama-e- wattariq for a male before sleeping?

3. If I feel like going toilet all the time, what do I do?

4. If a boy wants to get married at a young age because he can't control him self, what duaa can he read?

5. Duaa to be saved from homosexuality.

Q: After intimate relations if your impure hand touches some place like table etc will wiping with a wet cloth or tissue once clean the place or three times is necessary?

Q: I fell asleep on my sofa and had a wet dream, then I got up and felt my trousers but it was all dry. Do I have to clean the sofa?