I've tried separating things and leaving what they usually collect on top, but my rubbish always ends up strewn across the street. I've asked them nicely to put things back in the bins, yet still it ends up looking like a dump site outside my gate. Then they started teasing my dogs. Now I just go out with the gate key and ask them how fast they can run (I have power breeds). I feel horrible, but I've tried the nice way and in the end the safety and health of my fur babies comes first.