My problem is I'm completely messed with taharat najasat issues. I never understand whether things become tahir or not and now im suffering a lot due to these issues. I have some questions. Please explain me in details if you have time.

1. Can I use indian products ike, oil, biscuit, soaps, cream, cakes, hair oil, etc which does not consist of non vegetarian things. These indian products which are liquid and solids, because they are manufactured in india, and in india a lot of companies consists of non muslims, how come its possible that they made all those things without touching. So obviously it's najis because without touching they can't make things. Please explain the rulings regarding this. People says if you not sure you take it as tahir but in these cases its obvious that in bakeries, factories etc non muslims must have touched it.

2. I read in tauzee that najasat cannot be transferred after third mutanajjas. Please explain the rules regarding that. For example a kafir touched one wet thing and with the same wetness I touched it so my hand become najis. Now i want to know what number of mutanajjs my hand is. Likewise after that with the same wetness i touch the mobile. So mobile is which mutanajjas?

3. If my whole body is najis and if i take shower with qaleel water then all the water splashes in washroom is najis. So do I need to wash the whole washroom after i make myself tahir or we can apply the rule of ??????

4. What is the ruling of leather from India, China, Italy, Brazil, Portugal etc?

5. I asked my building person to clean my home as it was najis. My building watchman who will clean and wash my room is muslim.He also washes the rooms of muslims and non muslims as well in the building. So now I want to know after he wash my room shall I consider my room as tahir or najis? Because he will use same items which he already used in non muslims home to wash.

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1. Answer: From Ayatollah Sayed Sistani’s website

Question: I am living in India and I have a lot of doubts about things I am using and I eating. What is my duty about such things?

Answer: A well known religious law says: "Everything is ritually pure for you unless you come to know that it is ritually impure." This law declares everything to be pure unless one becomes sure a particular item has become impure. And as long as you are not sure that it has become ritually impure (najis), it is to be considered pure and you can apply all the rules of purity to it without any hesitation or doubt.

2. Your hand has najasat on it and touches another thing this thing becomes mutanajis then this thing touches another thing while wet that thing becomes mutanajis but after that it does not transfer

3. The leftover water from ghusl is not najis

4. According to Ayatollah Sayed Sistani If the probability of the leather originating from a zabiha (an animal slaughtered Islamically) source is so weak that people would not normally give any credence (for example, the probability of 2%), it is to be considered impure and this cannot be used in salat. But if the probability is not so weak, it can be considered pure and using it in salat would be permissible.

5. Being a Muslim you should assume he has taken the proper steps to clean your area and consider the area pure unless you become certain it is najis