urine

And the byproduct is urine!

And finally, the ammonia in urine does indeed make for an excellent stain-fighting solution, which is why Roman launderers often placed buckets on street corners to collect the urine of passersby.

It spreads from person to person when they come into contact with infected body fluids such as blood, urine and vomit.

The urinary system’s plumbing is made of several organs, including the bladder, which stores urine—the fluid that carries the waste products— until it’s a convenient time to pee.