Impurities on clothing and furniture

Q: If one has urine droplets and part of his underwear gets messed, does he have to change his clothing or can it just be washed off?

Q: Sometimes because of a severe cough, some urine comes out, in that condition does our clothes get napaak?

Q: Due to nightfall (Norturnal Emissions), the bed sheet and blanket get some stains of semen. This happens like twice in a week. So do we need to wash both after every incident of emission?

Q: What is the ruling where after urinating and making istinja has droplets of urine fall on his clothing? Does he simply wash the affected area, if yes how does he wash or does he have to change his entire clothing?

Q: If a napaak cloth is washed with paak clothes for 2 cycles with new, clean water used each time - then while the napaak one is still napaak, what is the status of the originally paak clothes?

Q: In an automatic washing machine we just have to put the clothes and the detergent and it automatically fills water and washes the clothes as well as it automatically drains the water after washing. Will the impure clothes become paak or pure? Some scholars say that washing impure clothes in an automatic washing machine does not make it paak.

Q: My neice diaper leaked and i did not know... I allowed her to sit on the sofa and as soon as she sat, a spot appeared on the sofa, I asked her to get up and changed the diaper. As a precaution I wiped the place with surf and then with a wet cloth. The next day I cleaned the sofa by pouring water over the spot three times. Has it become paak because my mother offers prayers by sitting on that sofa thats why I am concerned? Plus the water reached on the lower part of the sofa which becomes a bed. Does that part become napaak as I read somewhere that if you clean something with a jug of water, the water which flows is napaak? Keeping in mind it was just a spot which did not go on the lower part of the sofa. Also explain for the future how to clean a sofa matress, etc. if a child urinates on it?

Q: How to clean impurity from a mobile charger and wood?

Q: Will clean clothes become najis if najis if they are washed with najis clothes in a washing machine and then dried. My family members are praying in that clothes. What should I do now? 

Q: When urine gets on your clothes, how do you purify it?