Well since they are already in the condition that the very bruised looking one is,I would try acetone.You have to work fast ,wear gloves and rinse it off quickly to keep from damaging the vinyl more.Take it apart and work on one limb at a time so you can work faster.I doubt they have the blue wash inside because they don’t look like they were ever painted to me.Looks more like stains to me.Could be dye stains or ink stains.The LaNewborn looks like it is in the best shape and the easiest fix. LaNewborns make lovely reborns. The original paint from the factory comes off with little effort.