There are a couple of advantages in using an iron decon product like Iron-X...
- As noted, it makes claying easier
- It also cleans below surface contamination somewhat, which is something that clay cannot address...
If you are going to polish the car, you probably don`t "need" Iron-X as you will be removing the paint thickness that contains the contamination that Iron-X would remove. That said, I have found that using an iron decon product before polishing seems to make the polishing go smoother (and there is less risk of inflicting swirl marks from the abraded paint residue).
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