You could just pay a pikey kid to sit on your bumper with a bucket of water and a water pistol.
The bonus being, they're a pikey - you could pay them in 10 lambert and butler and a bottle of cider. Only problem would be, they're a pikey so everytime you parked up somewhere you'd come back and the entire area would be re-tarmaced.
I take it he bought the car then? Pics! Pics!