Impurities

Q: If wet semen or sperm is present on clothes and it dries after a while, would the garment be clean after scraping it off?

Q: What is the ruling on touching ethyl alcohol which is used in labs for making slides? I have a pathology class in which we have to use alcohol. Should I wash my hands after touching alcohol bottles even if they are dry?

Q: During the day, when I kiss and love my wife, one or two thick drops discharge from my penis. Is it compulsory for me to take a bath or not?

Q: My mother washed one of my impure dresses along with other dresses as it was wet in the rain and had mud over them. I didn't know about her washing the dresses, so I wore one of those dress and prayed. Do I have to repeat the salah? She did not use soap.

Q: Does a leather sandal become pure by just being rinsed under a tap? (It was messed with urine and impure water). 

Q: Yesterday I found a piece of toilet paper with stool on the shower floor, my concern is that my family had showered in there and while I am not certain if they specifically stepped on the toilet paper, since the entire floor within the shower is wet, I would like to know if this makes the whole shower floor napaak thereby making their feet (as they are barefoot in the shower) and all the surfaces their feet touched napaak as well.

Q:

1. If some impurity gets in a water jug that is used to purify one self after using the bathroom, is it alright to simply wash the jug by filling it up under running water and pouring it out?

2. Does one have to do this three times?

3. Does one have to wait until there is no more water dropping from it after pouring it out before refilling it again?

Q: My question is about urine drops. I have an issue of urine drops coming out of my body during prayer.

1. Kindly suggest a wazifa for cure.

2. When urine drops come out of my body, I dont know the exact place where drops are as the drops are sort of dried up. What shall I do in such a situation? Shall I wash the whole area or shall I ignore it?

Q: If one had a wisdom tooth extracted and has yellow discharge coming out from the extraction hole, which is not blood or pus, though one does not know exactly what it is, can one swallow it during prayer? What if in the case where the discharge is food debris that are being pushed out of the hole?

Q: I have a problem of urine drops. Is it necessary to make istinja after drops of urine come out or wiping with a tissue is sufficient?