There are a few things you can do to remove grease from a car seat. The first is to use a hairdryer to dry the area. This will help remove any excess grease. The second is to use a vacuum cleaner and bucket to suck the grease out of the seat. Be sure to use caution as the vacuum cleaner can be dangerous if it gets into the child’s eyes. Finally, you can use a plunger to suction onto the top of the car seat and pull until all of the grease has been removed.