A teenage boy has died after being hit by a car in Greenlane (file photo).

A 16-year-old window washer has died after being hit by a car in Auckland.

The boy was jogging across the road and looking in the opposite direction before the incident on November 27, police said.

He was hit by the vehicle in Great South Rd, Greenlane and taken to Auckland City Hospital in a critical condition.

GOOGLE MAPS The intersection of Great South Rd and Green Lane West is a popular spot for Auckland's window washers.

The teenager died of his injuries in hospital on Thursday, Auckland City East police area commander inspector Steve Clark said.

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The incident served as a tragic reminder of the dangers involved in window washing at intersections, Clark said.

"This is a very dangerous activity, which can have serious and sometimes fatal consequences, as pedestrians risk their safety by crossing in front and around of moving vehicles."

In August, Parliament passed a new law classifying window washing as a traffic offence.

Anyone found to be unlawfully washing or offering to wash a vehicle on the road which was not legally parked could be fined $150.

Previously, it was left to Auckland Council to prosecute window washers through the courts.

Figures released to Stuff under the Official Information Act showed 77 fines were handed out to window washers across the country in the first six weeks after the law came into force.

Nearly three-quarters of those were handed out in south Auckland.

Counties Manukau central, which includes the suburbs of Manukau and Manurewa, was by far the area where window washers received the most fines, with 34.

Window washers in Counties Manukau West, which includes Māngere and Ōtāhuhu, were fined 15 times.

Elsewhere in the city, only a handful of fines were handed out.

Police in Auckland City East – where the teen was hit – fined two window washers and gave a written infringement notice to one.

Counties Manukau district prevention manager inspector Matt Srhoj said the high number of fines in his area was down to more attention being paid to window washing hotspots.

"There have been quite a few complaints from members of the public and business associations," he said.

"These are particular intersections that get some attention from police."

Srhoj said "anecdotally" the law was reducing the practice of window washing, but more data would be needed.

Business Manukau has been a longtime opponent of window washing.

Its crime prevention manager Anton Walsh said the new law was deterring some adults who had been fined, but the biggest issue was with under 17-year-olds.

"At some sets of lights, it's been eliminated ... but [under 17s] are still very active in Manukau, worse than adults. Adults know they can only push so far," he said.

Walsh said many window washers intimidated drivers and were often intoxicated in public.