The local government can take steps: Dusting should be kept at all public places like bus stations, railway stations, gardens, theaters, proper waste containers should be kept in every area. Daily cleaning of public places is necessary. Make the public take notice of the importance of cleanliness. If someone is breaking a rule, make them aware of it.
You can also promote picking up litter, litter prevention, reducing future litter by promoting the single use of plastic. Coordinate community pick-ups. Divide your town into smaller sections and start creating litter-free zones. Get the inhabitants to volunteer as block/area captains. Work at keeping each section free from litter.