Mr Tony Seah, 55, would collect just about anything - plastic food containers, mattresses, standing fans, umbrellas, suitcases and even test papers.
His habit of hoarding started two years ago with newspapers and magazines, which he sold for some cash.
His mother, now 87, tried to keep their home clutter-free, until she moved to a nursing home last year after a stroke. That was when Mr Seah's condition took a turn for the worse.
Shaking his head slowly, he told The New Paper: "I just felt this urge to pick up something whenever I see it in good condition.
"I don't know why, but picking things up just made me feel better," he said.
The result is a four-room flat packed with so much junk, he had to climb over little "hills" of items just to get to the kitchen. Within a year, he filled the storeroom and three bedrooms.
Mr Seah then started putting things in the living room.
Space became so tight in recent months he could no longer walk freely around his flat.
"No big deal. I just had to climb over the clutter to get to the kitchen," he said, with a shrug of the shoulders.
He insisted the piles of junk were kept clean.
"When they cleared everything, there were only a few cockroaches running about. Not very dirty, what," Mr Seah said. But neighbours, like Ms Emily Tan, 55, felt otherwise.
She said a foul smell wafted along the corridor whenever he opened his door.
"A group of us brought this matter up to the town council when he started putting his things out on the corridor. We had to walk sideways past his junk to get to our flats," said the saleswoman.
She recalled an incident when she called for an ambulance for her husband.
"There was not enough space for the paramedics to push the wheelchair through the clutter," she said.
On Sunday, six volunteers from the Rivervale Horizon Residents' Committee, led by Dr Koh Poh Koon of the PAP's Punggol East branch, helped to clear the items.
Seven foreign workers were also roped in to help compress the trash into debris containers.
It took them nearly 10 hours.