Revellers cleared up the area where around 1,000 people gathered for an illegal rave that left four people in hospital over the weekend.
The event - called EggTech or EggTek - was organised by the free rave movement Peace Love Unity Respect (PLUR) and saw numerous people travelling as far as 200 miles to Kenfig Industrial Estate in Margam in the Welsh county borough of Neath Port Talbot.
Despite huge numbers of people attending the rave, this morning the location was cleared up with no big piles of rubbish and nobody left, reports Wales Online.
Much of the rubbish was cleaned but there were some plastic and glass bottles, cans and other items scattered around the area - along with a few pairs of discarded underwear.
Witnesses described semi-conscious bodies lying on the road over the Easter bank holiday weekend and the Welsh Ambulance Service attended in response to calls from the scene.
A road into the estate was closed, with around 300 cars being parked on Water Street leading to Kenfig Industrial Estate.
Members of the public were told to avoid the area and not to go there on foot or in vehicles.
Locals said they heard "thumping music all night" with videos showing huge crowds gathered around makeshift stages on the site.
One stage had a giant reflective green rooster on it which changed colours at night in the lights.
In some clips shared on social media, the sunrise was seen peeking out over the hills as many kept dancing.
People were also seen inhaling balloons as they danced in the busy industrial estate.
Local resident Chris Davies said yesterday: "I started work at 6am this morning and I thought it was a concert or something. You could hear it at the bottom of the hill. They're not much trouble.
"There were people walking down this morning and I stopped a guy and asked: 'What's going on? Is it a concert.' He just went 'Uuuhhh'. I wasn't getting much out of him."
On Facebook, people who lived 10 miles in Port Talbot commented saying they could hear the music from the rave well into Sunday.
One wrote: "It’s still going on. I’m all for having fun but this is ridiculous. I just want to sleep in the quiet that should be my home."
Another resident added: "Wondered what that constant noise was last night. I'm near Aberavon beach and could hear it."
South Wales Police were called to the illegal event at 11.40pm on Saturday, and by Sunday lunchtime it was still going strong.
By Sunday evening, police confirmed four people had been taken to the hospital with non-serious injuries as the event was dispersed.
There have not been any arrests at this point as investigations into who the organisers are continuing.
Last night, Assistant Chief Constable Mark Travis said: "We are engaging with those present at the scene to ensure they make their way from the site safely whilst respecting local residents.
"The event is now dissipating and those attending have been leaving throughout the afternoon.
"We have worked with partner agencies to ensure those who have needed help have been supported.
"It is disappointing that on one of the busiest days of the year that so many resources have been diverted from supporting local communities to manage an illegal event.
"I would like to thank the local community for their patience and support."
In an update this morning, Superintendent Steve Jones, of South Wales Police, said: "We are reviewing all lines of enquiries following the gathering at Kenfig Industrial Estate to identify any offences under the appropriate legislation. The relevant details of some offenders have been obtained and enquiries are ongoing.
"A large majority of those who attended the event left late on Sunday afternoon. Our resources remained in the vicinity of the scene."
