An unsuspecting worker has been stabbed in a Melbourne carpark after confronting a man over littering.

Security camera video obtained by 9NEWS shows a man appearing to discard something into a garden bed on Horne Street, Sunbury, about 6.40am today.

From inside his car, Russell Anderson, 62, spotted the littering and is seen in the video getting out of the vehicle to confront the younger man.

The stabbing was sparked by a confrontation over littering. (9NEWS)

The attack was captured on camera. (9NEWS)

Words are exchanged when suddenly the litterbug unleashed a series of blows, stabbing Mr Anderson in the neck with an unknown object.

The car-wash worker is then seen stumbling back into his car, driving past his attacker and taking himself to the local police station.

Meanwhile, the offender is caught on cameras returning to the crime scene and picking up the object he dropped in the garden bed, before fleeing towards Gap Road.

Mr Anderson remains in hospital after undergoing surgery for his injuries, which authorities said could have been “much worse”.

“The victim was very very fortunate that (the injuries) appear to be relatively superficial,” Detective Senior Constable Peta Rouse said.

Mr Anderson’s colleagues described the incident as “terrible”.

“I didn’t think it would happen to one of our workmates, especially at this time of day,” Liam Creed said.

9NEWS (9NEWS)

Investigators have described the attacker as Caucasian with dark brown hair, is aged in his 30s, and about 177 centimetres tall.

He was wearing a dark jacket and black jeans at the time of the incident.

Investigations are ongoing, with Det. Snr Const. Rouse adding the attack is believed to be random.

“It’s concerning. The victim was not known to the (offender) at all,” she said.

“Having said that, at this stage it appears to be an isolated incident.”

Mr Anderson’s co-workers have urged the offender to hand themselves in.

“I hope karma gets him, it’s just terrible what he’s done,” Mr Creed said.