you need to give your white car some love.
you need a claybar to remove these iron containments.
after you wash your car use the soapy water as lube for the claybar. short back and forth motions, light to medium pressure.
knead or twist claybar once its dirty, if u drop it throw it away, i like to rip claybars in multiple pieces just in case.
then a light polish, and keep a good layer of wax on the paint after to prevent it from happening again