Absolutely. If you live in a state that uses any form of road salt or brine solution, I can assure you that an iron decontaminator will bleed purple all over the vertical surfaces.
Light colored cars, especially white, show iron fallout more readily, but it's always there.
Also, be mindful in your selection and read reviews because brands do matter. I've found Carpro Iron-X to be the best. I've used products from other brands (Chemical Guys being the worst) that literally didn't do anything.
Also, be mindful in your selection and read reviews because brands do matter. I've found Carpro Iron-X to be the best. I've used products from other brands (Chemical Guys being the worst) that literally didn't do anything.