#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!
The infamous missing chunk from the Colosseum is believed to have crumbled during earthquakes that occurred during the 400s AD, close to the time of the collapse of the empire.
#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...