Cleaning Using Toilet Paper
I just wanted to add depth to your question. I did not mean to answer it. I think if we comoare ourselves to people 1400 years ago, with limited resources, we are overall very clean society than olden times. I am not a scholar, but If I use my best judgement to answer your question, I would say for Islam and prayer, we need to maintain ourselves relatively cleaner than average society around us and certainly can’t cross the lines below cleanliness standards set by Islam 1400 years ago.