To have an abandoned car removed, visit your city or county website or call the mayor or city manager to check for local ordinances regarding reporting abandoned vehicles. If you have a homeowners association, check those rules as well. Ask around to see if a neighbor owns the vehicle.
It is necessary to determine if the vehicle is abandoned, and if no one on your street knows who owns it, after several days you can probably assume it is abandoned. Look for clues such as missing major parts, flat or missing tires, or expired license tags. Use a non-emergency number to contact local law enforcement to report the abandoned vehicle.