YSK there's an app called CNV CityFix you can install on your smartphone that allows you to review and report issues in your area that the city should address.
Every once in a while I'll see some egregious graffiti, dumped trash, tree debris blocking a path, etc. More often than not, someone has already reported the issue in the app and the City is aware of it and adds it to their list. Within a few days (or less), a crew with the right equipment comes out and addresses it.
Being able to snap a photo and send the location to the city to put it on their radar is great for both parties. The city gets quality reports about issues quickly, and residents have a low effort way to get them dealt with.
You can also search for reported issues nearby, and there's often laughs to be had at people's descriptions of their perceived problems, or particularly witty ways people describe legitimate issues.
Would this include hoarders?