SFH neighbors lowering the appearance of neighborhood

[Jonathan Roveto]

I recently purchased another attached SFH, and I have run into a problem. I purchased the property, and the neighborhood seemed decent enough. I go out of state for a few weeks only to come back to see the neighbors have piled up crap on their porches and generally aren't keeping their exteriors up very well. I'm just starting to try to rent the property out, and I'm fully expecting the neighbors to scare some good tenants off. How does everyone handle unsightly neighbors? I am guessing sending a complain to code enforcement, but that probably won't work I bet.

Heck, if I had more money, I'd offer to buy their properties.