This... you need a full iron remover/decontamination bath. Follow up with a clay bar, a good polish and quality sealant to help prevent those particles from embedding in the paint again for a while. Living in NYC there is a TON of industrial fallout, especially if you park near any of the rail or shipping/boat terminals.You can buy a dedicated iron remover for around 20 bucks.
I used the meguiars wheel cleaner $12 which has an iron remover in it. It smells like a hair salon and turns purple on contact with the rust/iron. I let it sit a few minutes then washed off and rinsed well. Didnt notice any paint damage. I waxed after to prevent any further rust.
Yup I am a firm believer in the dawn as well. Of note, the Dawn will likely strip off any wax or sealant on the paint at the same time but it does a great job lifting dirt and other contaminants. IMO, you MUST protect the paint with wax or sealant after a dawn wash.The Soft Scrub and Barkeepers Friend cleansers are still mild abrasives abrasives that do a number on the paint even though they state they are no-scratch. I think that refers to porcelain sinks rather than car paint. Meanwhile, the detailers claybar floats on a film of something, and grabs stuff that stands proud of the paint surface. No scratches when used correctly. I make a thick foamy solution of Dawn for the task, and let it take off and emulsify residues found along the way by the clay. The foam is easily thick enough to lubricate the surface and avoid scratches from debris particles carried in the clay. Sponge wash and rinse first of course, to get the normal surface stuff off before the clay. I use the vendor-suggested detail spray for what it's designed for.
I like throwing an IPA or panel prep spray wipedown after the polish just to get the panels extra squeaky clean before putting the sealant on. Some polishes, like the Turtle Wax hybrid ceramic solutions polish, actually have sealant in them and recommend not wiping down before applying sealant. So as always, RTFL (read the f-ing label).Egg zacked lee. The Dawn and claybar are the second step in a more-stages prep and seal/wax. Wash with a little Dawn, then clay with the thick suds, then any paint chips or scrapes get repaired. Then polish as needed, followed immediately by a favorite sealant or wax.