Impurities on clothing and furniture

Q: If some impure drops fell on my mobile and I just cleaned it with something and it vanished from the screen or is it necessary to wash or wipe it with water?

Q: Is washing soiled impure clothes with semen and such in 40°c water with 45 min wash in the machine sufficient to make them pure? Even if u may still see stains.

Q: Is the moisture on the inside of the opening of the urine hole najis? Because this opening touched my underwear, like it unfolded and rubbed against my underwear on accident. No urine came out. It was just the urine hole but of-course this area is naturally wet so is it najis?

Q: I was wondering if it will be permissible to use antibacterial spray such as detol or zaflora to remove najasah on surfaces like doors, door handles and radiators by spraying and then drying with tissue paper.

I also read in a fatwaa that if the spray causes side effects you cannot use it. The sprays I have say they cause eye irritation. Does this mean I can't use it. Can you please respond as I need to know cause it will cause me alot of difficulty cleaning the radiators without spraying them and having to use a wet piece of tissue then a dry one. I also feel if I use a wet cloth I will just spread najasah everywhere.

Q: I travel for work and sometimes my agent takes me around in his vehicle. There are times when his vehicle has some dog hair on the seats and on the floor. By me sitting on the seat, some of the hair may come onto my clothes which I try and remove. Can I read salaah or are my clothes napaak? 

Q: I was putting my wet clothes into the dryer, the bottom of my pants touched the floor, I then put it into the dryer... Was it napaak? Did I need to rewash it? If yes, are all the clothes that got dried with it also dirty?

Q: I once saw some white residue on my washed pants. Our clothes washed in the washing machine never have detergent residue. I don't know why my pants had that. The problem is I didn't know which other clothes were washed with the pants. Are all the clothes impure? Should I repeat any salah?

Q:

1. I have a problem of mosquito blood staining my bedding. I therefore wash that part only but do not do so 3x, sometimes only once because the blood is removed. Is this ok?

2. The water that falls elsewhere on my bedding from the washing of the blood, is it considered napaak? Do I have to wash that area where the water fell as well? - since the water has been used to wash blood.

3. Is the area where the above mentioned water fell has dried with no traces of impurity, will it be considered pure?

Q: My wife is suffering from a serious disorder about purity. This is all due to urine.

If a child has urinated on a sofa and if someone sits there after its dried without being cleaned, will the other person be impure? Does he/she have to change their clothes?

If he/she sits somewhere else with those same clothes, would that place also be impure?

My wofe is really not well because of this and she’s always washing things, beds, clothes. etc. 

Q: Is there a way to differentiate between mazi and mani when I find a stain on my clothing after awaking from sleep?