Code section 18-5.1 states that all owners or occupants of a property shall maintain their property in a clean and litter-free manner, including sidewalks, grass strips, one-half of alleys, curbs or rights-of-way up to the edge of the pavement of any public street. Grass and weeds shall be removed from any joints or cracks in the sidewalk or curb. Violation of this section can result in a fines up to $2,000