Impurities on clothing and furniture

Q: If I see white discharge the amount of 1 dirham after performing salah, should I repeat my salaah?

What should be considered as najasat, only the white discharge or both white discharge and the wet part around it?

Q:

1. I was in my mother's house and my son urinated on my mom. My mum dried the urine with a tissue and mopped the area once. Then she washed my son just by wiping him with wet hands. I feel that he has not been cleansed properly. I brought him to my house immediately because wherever he touches with wet hands will become naajis since I still didn't wash him properly. The areas that he touched with his hands became naajis, so do I have to wipe that area that he touched also?

2. There are soiled urine clothes. Previously I used to wash them in a bucket 3 times but I don't squeeze the water out. Must I wash the clothes and clothes dryer rack again or will just wiping the clothes dryer rack suffice? 

Q: My non-baaligh brother often has accidents. This time, when he pooped in bed, I threw the bedsheets in the washing machine along with his underwear which was first washed by hand, and set the rinse 2 times for a total of 4 hours. During the second rinse I even threw in some of my clothes. As I was taking everything out of the dryer, the stains from the sheets were completely gone, and all the clothes smelled good, but then his underwear had a very light brownish colour and some odor. Does that mean the underwear is impure and everything else that was washed with the underwear is also impure? I put everything in the dryer before I noticed any of this so does that mean the dryer has to be purified now? What must I do?

Q: What is the correct procedure of washing clothes by hand to make them paak? Is it ok to do this:

First rinse out the bucket, then put the clothes in the bucket, and add detergent and clean water from the tap. And soak for a few mins. After take the clothes out one by one and rinse under the tap and squeeze out the water several times.

Q: During prenancy, due to extra pressure on the uterus, it is too difficult to move and urinate. This pressure causes some fluid to be discharged from time to time especially when you try to move or have urine pressure. For namaz and wudhu, do we have to wash the trouser again and again? I live in a joint family home and it looks very wierd and awkward. If a lady teaches in school, there might be no washroom to wash the trouser. I have only two dresses then I'll have to wash the trouser many times for offering salah or reciting Quran?  

Q: I work as a blockman in a butcher. Due to the work environment I always get blood on my clothes. If I see it, I rinse it before I read salaah. Sometimes I only see some blood spots after I had read my salaah.

1. If I see blood stains (from meat carcass) on my clothes after performing salaah, is my salaah accepted or should I repeat the salaah?

2. Is blood from the carcass paak or napaak?

3. Do I have to wash or change my clothes before performing salaah if it has blood stains on it?

Q:

1. If a person feels splashes of water on the uncovered part of his body, like on his back while making istinjaa, that water is impure and napak. How do we clean that part of the body?

2. If a dog sneezed on my clothes but I am not sure if anything came on my clothes because the dog was some distance away. How do I clean my clothes and the things which I will use to wash my clothes, like the bucket, etc?

Q:

1. If one finds any impurity, like a small amount of stool on his clothes, would the clothes be considered napak and would the prayers offered with such clothes need to be repeated?

2. What amount of a najasat renders a cloth napak and impermissible to pray with?

3. If I need to repeat the prayer, would only the Fardh and witr be repeated or also the sunnat and nafl?

Q: My 4 year old kid sometimes urinates a few drops in his pajamas and doesn't tell me. When I check then I find his trouser wet. We have leather sofas, so when I check the area where he was sitting, it's mostly dry. Maybe it gets dry by the time I go check or maybe it doesn't get wet at all. Should I wash that area or how do I purify it?

Q: If menstrual blood stains a black garment and we cannot see the stain at all, will it be pure if we wash it three times?