A way to keep your town clean is to put up reminders. Put posters on cross walks and put recycle bins around. Another way to keep your town clean would be to volunteer. It's a simple but efficient way and could set an example especially if you get a group all at once. Lastly, setting up a fundraiser to raise awareness of reasons to keep your town clean. People need to know why you need to keep your town clean, let them know dangers and hazards.
hope that's good enough