Another Iron-X question

[SATracker]

1) There was a post quite a while back that said, essentially, If you detail a white car use Iron-X. Is For those who use Iron-X, is there a reason white cars especially should use iron-X or was the comment probably one guy's observation?
2) In using Iron-X there is the warning- don't let it dry on paint. Before I find out the wrong way, what happens if Iron-X dries on paint?

[quantim0]

I have a metallic white car and it needs to be done every 1-2 months. I do it that often because you can see the iron particles on the back of the car and it bothers me.

If you let it dry on the paint I'd imagine the purple from the iron might stain the paint.

Sent from my Moto X

[SATracker]

Thanks, man. Makes sense