Hey Rick,
Just like this...
http://www.carpro-us.com/decontaminate/iron-x-500ml/
1.-Shake the bottle well.
2.-Lightly cover the surface with Iron X using the supplied spray nozzle. (For best results apply to a mostly dry surface, a few drops of water is ok). I recommend that you spray as needed and spread it with a small sponge or applicator to cover the entire surface. Only cover the surfaces you wish to decontaminate. The product is strong so you don’t have to be wasteful. Just make sure it contacts the entire surface.
3.-Allow the product to dwell for 5 minutes in the shade. DO NOT allow it to dry in the sun. On light colored paints you will see the product dissolving ferrous particles as it turns color. On darker colored paints everything is happening in exactly the same way. It’s simply more difficult for you to view the color changing effect on darker colors.
4.-After allowing to dwell take a damp (not soaked) grout or other paint safe sponge (or other media if you prefer) and agitate the surface.
5.-Thoroughly rinse the surface.
Don’t forget to rinse your media out also. I like to have a dedicated Iron X sponge but that isn’t necessary.
PRECAUTIONS:
A.-Use outside or with sufficient ventilation.
B.-Use latex or Nitrile gloves, and eye protection.
C.-If there is an inordinate amount of tree sap, tar, other organic material, wax, or sealants on the vehicle I recommend you strip them first with TarX so Iron X can attack the ferrous particles without any interference. This is not required but is how I like to do it for best results.
