Get this round my area..
Its always in the same spots, theres a little hidden Cul-de-sac, at the end you'll frequently find dumped beds, couches, fridges etc etc... actually somebody even left a caravan!
What frustrates me, it happens so frequently (at least 1-2 times a week), that it would be worth the effort to setup surveillance (just some hidden cameras) for a few weeks, to identify the constant perpetrators - Then jump on them all at once! It might be costly, but it will get the message out.