Keeping your car clean can improve the length of its life in a lot of ways. Regularly washing the exterior keeps rust and paint blemishes from forming. Especially if you live in an area where winter weather requires a lot of salt on the road, you will want to make sure to wash that corrosive stuff off of your vehicle before problems can happen. Be sure to pay special attention to the wheel wells and undercarriage.
Cleaning the interior of your car can keep it in great shape longer, too. Maintaining seats, dashboards, and floorboards not only helps them last longer, but it keeps your car a more pleasant place.