There's definitely a lot less crap being left on Stockton Beach, NSW, since they banned camping on it. It used to be, after every long weekend, there were piles of garbage left all along the beach, and turds and paper left behind the dunes, with not even an attempt to bury it.
I got sick of going there for a while, and when we did venture there, mainly my mrs would always fill the back of the 4WD with bags of rubbish, I wasn't so keen though after quite a few bags leaked stinking juice in the back.
They don't have a skip bin on the entry tracks, and after you collected all this crap you had to find a close enough skip bin to dump it in. And that wasn't easy, because at shops etc they don't want you filling skip bins with other peoples crap. I asked a ranger about it one day, he hand balled us to the council, who's reply was "If we put skip bins there, all the local will just fill it with home rubbish" One ranger did say we could put the bags on the back or their vehicle, if they were there. But they usually just speed past you anyway.
Pisses me off that I can't camp there any more, but they had to do something to try and stop the rubbish piles.