DesertRose....people just don't care anymore. Leaving the couch in your yard is convenient for them. They probably don't think you will enforce the rules.
I lived in an apartment (I lived upstairs and had neighbors downstairs) and their child was noisy. She was 9 and always blasted her radio, left her toys and bike at the bottom of our steps so we literally had to jump over it from the bottom step and her parents would fight at all hours. One time, I dropped my phone. It was in the kitchen where there was no carpeting to muffle the sound and they called the land lord on me and told him I was making all kinds of racket. I was stunned. I was relieved to move from there.
One summer, her daughter ended up with head lice. My boys ended up getting it from her. I shaved their heads, treated them....washed everything...everything that you are supposed to do, I did. My Dr. cleared me and my boys and said we were lice free. Luckily, I avoided getting them. One month later, I got it. I had babysat for her. Her mother assured me that the lice was gone. I was livid! I have blonde hair and it was very long...so it was very difficult to get it all out of my hair. When I informed her that her daughter still had lice she got irate and blamed it on me. She said I brought it home from work. I was working in a turkey processing factory at the time. I explained to her that we wear hair nets at all times while in the factory and that lice is species specific. Humans can't get bird lice, canine lice, feline lice. It's impossible. She still swore that she got it from us. I didn't let the boys play with her again. Shortly after, we moved.