Impurity on body, clothes or place of Salaah

Q: If I place a pure prayer mat on an impure carpet and pray on it but while making sujood the edges of my long jilbab touch the carpet, will my salah be valid?

Q: I prayed salah from puberty with proper wudhu but without ghusl for 7 years because I was not aware of the masalah of ghusl. Should I reperform those salahs?

Q: If blood splashes on my clothes while slaughtering, can I perform my salaah with that clothes? Does the blood have to be a certain amount for it to be impermissible to be read with? What if it was just small dots of blood that splashed on my clothes? If I read salaah with the clothes, is my salaah jaaiz?

Q: Is a ladies salaah valid if performed with her baby tied to her back, due to safety reasons when performing salah in a crowded place?

Q: My wife is expecting and colostrum/milk began expelling. I would like to know the following rulings:

1. If the clothing becomes soiled with a few drops, can salaah be performed?

2. After birth, if the clothing becomes soiled with actual breastmilk, can salaah then be performed?

Q: Is pre-coital fluid considered najaasate ghaleeza or khafeefah?

Will it invalidate salaah?

Q: In my country, it is compulsory to use hand sanitizer before entering any shop for shopping, etc. All of the hand sanitizers have alcohol in it. What is the ruling regarding praying salaah, touching Quraan or eating after using it?

Q: I work in a hospital. The hand rub we use contains alcohol (ethanol) mixed with glycerine. Some drops fell on my clothes and dried. Can I pray with that clothes?

Q: If I have filth on my clothes less than the size of a dirham and water touches it and the diameter increases from one dirham, can I pray in those clothes?

Q: A fowl came into the home and soiled the carpet with droppings. Should I wash the soiled area only, or do I have to wash the entire carpet? If salaah was performed on the clean portion of the carpet before the entire carpet was washed, will the salaah be valid?