One side of Clapham High Street was cleaned as normal this morning while the other was left dirty.
It was all to show the amount of litter that is dropped in 24 hours.
Lambeth was just one of the local authorities that took part in a social experiment this weekend, in partnership with Keep Britain Tidy, to reveal the extent of the nation's littering behaviour.
The group say £1billion is spent cleaning the UK's streets every year which could pay for 4,400 libraries, 27,000 paramedics or 32,000 fire fighters.
