#13 Urine contains acids and chemicals that remove stains from organic textiles... so yeah, wash with urine and RINSE with water and get whiter cleaner clothes. Just because urine is now wasted, and not good to use anyway due to modern diets, doesn't mean people of the past were stupid!
It seems Roman Emperors have a mean streak, as Emperor Commodus was known for fighting unfairly in gladiator battles. Commodus reportedly fought against men that had lost their feat or offered his opponents sponges instead rocks as weapons.
#13 Urine contains acids and chemicals that remove stains from organic textiles... so yeah, wash with urine and RINSE with water and get whiter cleaner clothes. Just because urine is now wasted, and not good to use anyway due to modern diets, doesn't mean people of the past were stupid!
All historic evidence is just stories. So, just because you don't know of it doesn't mean it doesn't exist...