If you have a car with cement stains, there are a few things you can do to remove them. The first is to use a mild soap and water solution to clean the area. This will remove any dirt and debris that may have built up over time. Next, use a dry cloth to rub the area down until the stains are completely gone. Be sure not to use too much pressure or you may cause further damage. Finally, apply a light coat of paint or sealant to the area and let it dry. This will help protect the car from further damage and make the stain disappear completely.