Probably the first and easiest thing to do is to print and stick the Flat Chat Move it or Lose It poster to the windshield of the car.
And have a look at this previous post on the topic … and this one too, for good measure.
In simple terms, provided you fulfill the requirements in the strata Regulations, you can have the vehicle towed at the car owner’s expense. Our poster has been designed to comply with the Regs provided it is filled in correctly.
But I reckon it will solve your problem … and all for the cost of a sheet of A4 paper.