Folks, don't try this at home!
The ancient Romans used urine to get their white tunics clean and bleached. Of course, the ammonia contained in urine was what did the trick. Fullers collected urine for this purpose. Clothing was immersed in the repugnant liquid and bleached white. Needless to say, the smell of urine didn't just leave the clothes once washed out with water and one can only imagine how even the most wealthy and notable Romans smelt truly 'pissy'. Combine that with the charming smell of fish sauce (a favourite with the Romans) and the stench would be unbearable to the contemporary nose.