Dead beat neighbors don't give a crap about anyone else. They only care about themselves. The only way to get through to these kind of people is to hurt their pocket book or cause them an inconvenience. I have been exposed to enough dead beat neighbors to know that trying to reason with them in a civil manner is a complete waste of time. They only care about the path of least resistance. If the least resistance path of doing something results in negatively impacting you in some way they don't give a crap. So all you can do is make the path that affects you NOT the path of least resistance.

Personally, I confront the neighbor and tell them to stop whatever they are doing. No Nice guy beat around the bushes crap either. Then if it does not stop, the neighbor magically starts to have a lot of bad luck all the sudden. When they stop doing what they need to stop doing, their bad luck streak magically stops. It takes some people a little longer than others to link the correlation of their bad luck to what they were told not to do, but they all eventually figure it out as their "bad luck" increases exponentially as time progresses.

I am not saying this is legal, but some people really don't get it unless its done this way.