I don’t know where you live, but where I do, many usually uneducated workers, peasants, and petty bourgeois think it’s normal to throw rubbish everywhere. Even educated peoples, which are usually well-off seem to have the same problem, so while building and planning such projects, which in my case is a communal garden, take it as an opportunity to make such basic concepts normalized and encourage more community building along side political agitation. In my experience, the youth are usually the most prone to radicalization, so focus on planting seeds there.

Hope the best