Impurities on clothing and furniture

Q: If I found some mazi drops on my underwear after Salaah and don't remember exactly when it came out. Is my prayer valid?

Q:

1. If I see a wet dream and I am wearing a pad, does it make the bed sheet najis if there are no signs of impurity on it? Should I change the bedsheet

2. I keep my scarf for prayer on the same bed. Has it become najis?

3. If I put clean wet or dry clothes on the same bedsheet, will they become impure?

Q: My mattress got soiled by urine twice. I tried purifying it by pouring less than a kurr water over the places. Can it be considered paak?

Q: My question is on behalf of my colleague. He is having a problem since 6 years. His life is in danger as his parents are not with him. His parents are in India. He lives in his uncles house. He told me that one day he was sleeping without going to toilet and he urinated while was sleeping in his bed. He is very shy to wash his bed sheets because he will be asked by his uncle and aunt. After that he washes his hands regularly and they thought he got ocd because they don't know his matter. They took him to the doctor. Now he's afraid of tell them about his problem because if he wants to wash his bed sheets they say it's washed and his duvets are not clean as well. They always follow what he does. So brother please tell me what should he do now? He's always thinking about it. Please give him some advice.

Q: I wanted to know that if while talking to my wife on a video call I get some sperm spot in my underwear, is it necessary to have ghusal?

Q: To clean an impure toilet seat, is it sufficient to first clean with wet tissue paper and then wipe with dry tissue or do you have to actually pour water on the seat to make it pure?

Q: If a towel was put on the bed and some semen after intercourse went on it which then transferred to the other bottom side of the towel which was touching the bed sheet then does that mean the bed sheet is also impure? This is because the wetness of the semen from the bottom side of the towel touching the bedsheets could've been transferred. Although when checked after few minutes the sheet was dry and and there were no stains. Should I have to wash the bed sheet?

Q:

1) Whilst seated on a high pan toilet and one relieves oneself, does the water, which is often polluted and napaak, that remains and comes from inside of the high pan toilet or commode, happens to splash upon any part of one's body, does Ghusl or wudhu become necessary so that Salaah be performed?

2) When having a Fardh Ghusl, does soap have to be used as a means of removing the dirt and impurity or najaasat which is on one's body, such as after a wet dream, or does merely passing water suffice for the Fardh Ghusl to be done to render one paak and clean to perform Salaah?

B) If merely passing water over the affected or dirty parts of the body is sufficient, is there a specific number of times that water needs to be passed over the dirty parts to render one paak and for the Fardh Ghusl to be completed so that one could perform Salaah?

3) Clothes that have become napaak as a result of wet dream or any najaasat or droppings of urine falling on them, do they become clean as a result of washing them in a washing machine only and thereafter worn and perform Salaah?

4) Is there a specific number of times to wash when making Istinjaa?

5) Does blood which comes onto the topee (headgear) while in Salaah, render the Salaah null and void?

B) if yes, does wudhu and Salaah be repeated or only Salaah?

6) If dried blood is on the topee (headgear) does Salaah read with it be valid?

B) If it was washed and still the marks of blood are visible, will one's Salaah be accepted if one reads Salaah with it? 

Q: I would like to know whether mazi is napaak or not and after the release of mazi is it compulsory for one to make ghusal or change his clothes or can he perform Salaah in that clothes?

Q: I have a question on behalf of some one. My question is that if anyone urinates in the bed without knowing while he is sleeping and shy of washing his bed sheets because what the other people will say, what does he have to do?