17/09/2026
Ancient Romans had professional laundries.
But they did not use detergent.
They used urine.
Across Roman cities, businesses known as fullonicae cleaned clothing and processed cloth for paying customers.
One of their most important cleaning ingredients was human urine.
It sounds disgusting.
Chemically, it actually made sense.
As urine sits, compounds inside it break down and produce ammonia.
Ammonia is alkaline and helps loosen grease, dirt and stains from fabric.
Roman fullers learned that urine worked remarkably well as a cleaning agent long before anyone understood the chemistry behind it.
So they collected it.
Containers could be placed around busy streets and public areas where people could relieve themselves.
Once enough urine had accumulated, it was taken to the laundry.
Then came the part that would probably horrify a modern customer.
Dirty clothing was placed into vats with water and urine.
Workers climbed inside barefoot.
They then stomped, twisted and trampled the clothing beneath their feet.
The movement helped work the liquid through the fibres, almost like the agitation cycle inside a modern washing machine.
Afterward, the garments were removed and thoroughly rinsed in clean water.
They could then be beaten, brushed, dried and treated further depending on the type of fabric.
White clothing could even be exposed to sulphur fumes to help brighten it.
This was not some tiny fringe practice.
Fulling was an important Roman industry.
Pompeii alone has produced evidence for multiple fullonicae.
One of the best known is the Fullonica of Stephanus, a large laundry that appears to have been converted from a private house.
Its stone basins and washing areas still survive today.
Fullers handled expensive clothing, particularly wool.
Customers trusted them with garments that could be costly to replace, and Roman law could hold a fuller responsible if clothing was damaged or lost.
The job was dirty, smelly and essential.
Urine became so useful that it even attracted the attention of the Roman government.
During the first century CE, Emperor Vespasian imposed a tax associated with urine collected from public facilities.
According to the ancient writer Suetonius, Vespasian's son Titus complained that earning money from urine was undignified.
Vespasian responded by holding money from the tax to his son's nose and asking whether it smelled.
It did not.
The story became associated with the famous phrase:
“Money does not stink.”
Urine was valuable because businesses such as fullers could put it to practical use.
To us, washing expensive clothing in human waste sounds completely backwards.
To a Roman laundry owner, it was simply chemistry that worked.
And Romans were not alone.
Urine continued to be used for cleaning and textile processing in later centuries because ammonia remained useful for removing difficult stains.
Modern detergents eventually replaced it.
But the basic principle is not as strange as it sounds.
Ammonia based cleaning products still exist today.
The difference is that we no longer have to collect the raw ingredient from people standing over jars in the street.
Nearly 2,000 years ago, however, Roman clothes could begin their journey to cleanliness in one of the least glamorous ways imaginable.
Someone urinated into a container.
A fuller collected it.
A worker poured it over dirty clothes.
Then climbed into the vat and stomped on them with bare feet.
Ancient Rome could be extraordinarily sophisticated.
It had aqueducts, heated floors, public baths, concrete buildings and complex industries.
It also washed laundry in p*e.
