Graffitti on buses and bus shelters in the West Midlands is causing £1 million of damage every year. And evidence shows it is most often caused by a few persistent vandals who attack time after time.
MPs are now adding their weight to a campaign to get tougher sentences in the Magistrates' Courts.
This graffiti is not of the spray paint variety, it's deeply etched markings in bus windows, tags, caused by blades, stones and other sharp objects.
The cost of repair is enormous. National Express is spending £1 million pounds a year to repair the windows and equipment.
But the company is growing increasingly angry because they say little is being done in the courts to deter the vandals.
The worst offending is on buses in Birmingham City centre but it is happening too in Coventry and the Black Country. National Express has enlisted the support of MPs who will lobby the magistrates.
Meanwhile National Express want passengers who witness the graffiti to get in touch anonymously by text, to stop it happening.