I want to try de-conning the wifes car (before I brave my own) as it has ALOT of iron fallout etc. Now I tried some iron remover but this didn't remove all of it when powerhosed off. Now what I'm unsure of is what to do next with the hard to shift bits. Do I repeat with the iron remover, or agitate the remainder with a cloth or something, or do I move onto claying. Im just worried that claying with iron deposits still there may incur some damage. Or is the idea of claying to remove these hard to move final deposits? Bit of a novice at this level so just after some advice, thanks.