I wondered is it worth using Iron X? OK I can see the more contaminant one dissolves off the less one has to clay off ( less mechanical marring etc.) and it might shorten the claying process, and if machine polishing reduce the amount of damaging crude on a polishing pad. And it might remove more embedded contaminants, that over time could damage paint (er like would I ever even notice it?? ) Does it make a real difference? I am being open minded here. I remember when a Friend first introduced me to a Clay bar. Sounded like the most ludicrous waste of time, and potentially very damaging .... “come on scrubbing some clay over a slightly gritty car ... Nuts” Ooops ... how wrong can one be ... Once used! hooked for life!! Super smooth, Glossier look, deeper shine and hey it cuts the time to wax in half ... it couldnt get better Well it did ... as the beading shed dirty water better and for longer! Assuming it is worth it. Which is better Carpro Iron X ( states safe on all car surfaces including aluminium, anodised and chrome covered plastic) Or Bilthamber Korrosol? -generally good value stuff, but it does warn about Chromed Plastic parts and anodised trim and plastic parts in tne Spec sheet. I want the safe route!