Locals have told of their horror after discovering piles of faeces and bottles of urine discarded outside their homes.
The grim finds were made in recent weeks along several streets in Coventry, West Midlands.
One resident photographed a pile of faeces surrounded by soiled toilet paper, while another shared a photo of dozens of bottles of wee found chucked by the side of the road.
Litter picking group Coventry North West Wombles resorted to cleaning up the human excrement, saying it is becoming a "regular occurrence" in the city.
Local Jane Garner took part in the clean-up and blamed delivery drivers as she found human faeces across several sites, including lay-bys, gateways and business parks.
She told CoventryLive : "Yes, there is a problem with some delivery drivers.
"We notice at various areas where HGVs park up such as lay-bys, field gateways, etc, that drivers are urinating and defecating in these areas.
"There is also the issue of drivers urinating into bottles and chucking these onto the side of the road, on to roundabouts and verges.
"The areas I have noticed it is around the Amazon roundabout on Coundon Wedge Drive and either side of the entrance to Lyon’s Park and also among the trees by the Staircase Lane footpath where drivers park in the field gateway.
"Other areas I’m aware of are the A45 lay-bys where the lorry drivers park up. Obviously there are other HGV drivers and not all drivers do this but it is definitely an issue."
Coventry City Council told the Mirror that it is the responsibility of the police to stop such behaviour.
The authority added: "Public defecation and urination are actually criminal offences and as such primarily would be the police’s responsibility, but we would assist where appropriate."
Earlier this year, a delivery driver revealed he often finds plastic bottles and bags full of urine in his van as others on their rounds have no time to stop for the loo.
He described working conditions as “horrendous” because of the pressure on completing rounds
The driver told Wales Online at the time: "I run everyday - you physically can't stop.
"If you do, you fall behind - the managers are on the phone with you asking you why you're behind or why the van has been parked up for three to four minutes."
He added: “I can honestly say, most of the drivers don't take a break because they don't have the time to take it.”
West Midlands Police has been approached for comment.
