I hate my neighbors

Yesterday, Hail and Raph went and rode around on the max train for awhile so that I could clean up the house. I spent 4 hours extensively cleaning everything in my house, I even scrubbed out my bathtub, one chore I can't stand. I fished out cars from under the fridge, and I took out all the garbage and recycling that I found throughout the house. Surprisingly, when you go on a cleaning frenzy, more garbage comes around that you thought was in your house.

When I went to carry out the garbage, I found that someone had threw up on the landing between mine and the neighbor's house. I live on the third story, it is highly unlikely that a bum or some random person would be up on my level unless they were visiting me or the neighbor since they are the only two condos up here. There is also a bunch of garbage in front of the neighbor's house-- phone books, food wrappers, the tobacco from cigars, and someone wrote, in bright red, on the building. It is some sort of graffiti that I can't read but it's offensive and I don't care to look at it every time I look out my front door. I have contacted the HOA and my complaints have gone unheard. I am beyond frustrated and I really don't know what to do about it any longer.