How to get rid of brown marks on white car paint?

[Homer]

Hi folks, lot of brown marks on the White car paint plus my uncle used a rough sponge to remove some dirt but has made really white spots appear on the car. Any ideas on what products to use to make it go back to normal? I don't want to buy equipment to do it so products I can use on their own. Much appreciated. Thanks.

[dansmith180]

The brown marks are probably iron fallout, all cars have some but its very obvious on white, buy some ironx and use that on the paint to sort that out.


The white spots sound like they might be flat spots where the aggressive sponge has dulled the surface maybe? You got any photos?