Vandals went on the rampage in Prestwich and damaged up to 30 cars.
Police in Bury are investigating after two men were seen to be vandalising dozens of cars - knocking off wing mirrors and jumping on car bonnets.
It is thought given the number of cars that have been targeted that the total repair bill for all the victims will run into thousands of pounds.
Officers were first alerted at about 6.30am yesterday when the vandals were seen to be jumping on a car on Lowther Road.
Since then, police have received up to 30 further reports of criminal damages to cars on Scott Road, Prestwich Park Road, Masefield Avenue, Shelley Road and St Anns Road.
However, police suspect many other cars may have also been vandalised and the owners have either not realised or yet reported them to police.
A Peugeot 206, BMW, Mercedes, Vauxhall Corsa, Renault Clio and a Kia Sportage were among the cars targeted.
One man has been arrested on suspicion of criminal damage and possession of an offensive weapon and remains in police custody for questioning.
Police are now appealing to anyone with information to come forward and also urging anyone who has not yet reported any criminal damage to their cars to do so.
Detective Sergeant Benjamin Cottam said: "What we are dealing with is mindless, wanton vandalism on a very large scale. This was not one or two cars that were scratched but at least 30 cars, probably more, that sustained considerable damage at the hands of these vandals.
"We have dedicated significant resources to catching those responsible. These individuals have caused a lot of upheaval and upset in this community and we will do everything we can to identify those involved.
"It is not just the financial hassle of paying for repairs that has upset the victims but the time it will take to rearrange work and home commitments to arrange for those repairs and sort out the mess caused by two wanton vandals."
Anyone with information is asked to call police on 101 or Crimestoppers on 0800 555 111.