Tahaarat

Doubts regarding urine drops

Q: Whilst I was urinating, I felt as though a drop may have touched my leg as I thought I felt it. The question I have is that I am unsure if there was urine on my trousers and I assumed they were clean and prayed my Salaah. Was my Salaah valid, and also, if a scenario like this occurred in future where I am unsure, should I assume that my clothes are clean or my clothes are dirty?

Doubts regarding impurity

Q: A year back something impure like alcohol fell on my slippers when I went to some place. Now I don't remember whether after coming back I washed it or not or later I washed it. I don't remember whether I kept the slipper unwashed or washed in my cupboard. Though after that I have washed it a lot of times but I can't remember whether that time I had washed it and kept it in my cupboard. Now my other shoes were also kept in there with these and I can't seem to remember whether I kept them inside washed or not. Will my other shoes be impure or will the cupboard be impure as the shoes might have touched. I'm feeling very distressed please help.

Washing the toilet seat

Q: If someone is in a state of Janabah and when using the toilet, semen falls on the toilet seat, will using the jug to splash water on the toilet seat wash away the semen or should a wet toilet paper be used also to wipe the seat to make sure it's clean?

Dialysis

Q: I would like to know if when a person is on dialysis (haemodialysis) where your blood comes out goes into a machine gets filtered an returns to your body. Does this break your wudhu?