Iron will remove all iron fallout from all exterior surfaces.
 
Directions of use :
Simply spray on to the surface and allow it to react - turn purple
rinse the surface clean 
 
Iron can be used as a wheel cleaner:
spray on to the wheel - 1 wheel at a time do not let the product dry
allow the product to react
rinse the wheel 
it is always best practise to then use you wheel brushes to thoroughly clean you wheels