Some of the professional detailers might see this product as an ideal decontamination tool for cleaning embedded iron in your cars' paint. It does work for this, however we don’t suggest using it or any others for this type of job. Unless you can be 100% certain they will not get on non coated or exposed steel on inner non coated surfaces like guards, vent & cowl panels etc, as it will react on the bare steel if it's not washed off completely and try to keep working on the exposed area, helping create rust.
Unless you really have an issue with iron deposits on your car, keep it for what it works best on. The wheels!