I Iron-X'd the paint today on a BMW I'm detailing. Was perfectly fine and pulled quite a lot of fallout off it. I just do one panel at a time. Spray with PW, Spray Iron-X on, leave a couple of minutes, PW off, wash with car shampoo and wash mitt (have a separate mitt for this) then PW rinse and move on.
Probably overkill but better to be safe with it.