Tahaarat

Doubts regarding impurity

Q: My two questions are below:

1. When I shop at a butcher or other store I often find that even though the store is muslim owned they often have non-muslims helping to pack the bought stuff. On a few occasions I found that when they packing my stuff which is often frozen and therefore wet/moist they first lick their fingers to open the packet, therefore their hands have their saliva and then they touch my bought items which are wet. Does this then make my bought items napaak as I am not sure if their saliva is paak?

2. My aunt lives in a complex, near the entrance gate the floor is always wet as the cleaners sometimes clean the front area and also the residents throw the water they use to clean their homes out in the front. My aunt also mentioned to me that the sewage pipe is near the gate and it sometimes leaks. Therefore I never know the source of the wetness on the floor. When I visit and walk on this wet area (it is hard to avoid as the whole entrance is wet), I am not sure whether my shoes and everywhere I walk thereafter with my shoes are becoming napaak. Please can you advise what I should do in this situation?

Cleaning a soiled sofa

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?

Cleaning the blood and pus after bursting a pimple

Q:

1. Is it necessary to wash the area from where a blackhead is removed?

2. I often get pimples on my face and other parts of my body I heard that the pus that comes out of the pimple is impure, does it means that I have to wash the area after it came out or just remove it with the help of tissue paper? If it is necessary to wash then if a pimple burst on my right cheek or forehead, how to wash it (just put some water on that area or to wash my whole face). 

3. Sometime blood also comes after the pus and after it stops a white water like fluid comes out what is ruling about it? Do I have to wash it or just use tissue paper to remove it?

4. Often pimple burst while taking ritual bath (Ghusal) What to do then? Sometimes blood or pus takes a lot of time to stop i.e. it keeps coming out in small amounts, what to do then?