Impurities on clothing and furniture

Q:

1. Do I have to repeat salah if I had discharge on my underwear?

2. Should I perform qadha salah if I am unsure/do not know/doubtful whether a condition of my salah was fulfilled?

Q: My neighbours often barbecue in the summer, and the meat they eat is not halaal. Usually, when I wash the clothes, I put them outside to dry.

If the smoke from the impure meat comes into contact with the wet clothes which I put outside, will the clothes become impure?

Q: My brother bathed in a tub of water after urinating without doing istinja. Will the things he touches become impure? What if we cannot see, taste, smell the impurity, do we have to clean that object?

Q: Can salaah be read with discharge on one's underwear?

Q: I put a tissue around my private part. When I removed the tissue, it was damp. I had touched the damp tissue and with the same hands I touched the electrical switch and left it there for a few days. The switch is wet most of the time. I touched it when it was wet with wet hands but the switch had no trace of impurity on it and my hand did not have any trace of impurity on it. If I touched my clothes with the same hand, will the clothes become impure?

Q: I am buying a cupboard and a bed from a Hindu family. Do I need to do something to make it paak or there is no issue?

Q: As white discharge breaks wudhu, sometimes it's not possible to change cloths or wash it off or clean that particular part or cloth, like lack of time or at college or somewhere else. My question is, can we still offer the salah in the same cloths but with a fresh wudhu?

Q: I peed in my pants recently while in the Haram of Makkah. Is there any kaffarah? I did not mess the floors.

Q: What if some dirty thing in the form of liquid makes your shoe dirty, can we clean it by rubbing it on the ground?