Rust dust eating paint ?

[V8Bart]

A few years ago some one next door had iron gutters fitted and the iron dust from grinding drifted onto car and with rain rusted into the paint, with it being dark grey it was hard to see but felt like sand paper.

I now have a white car and the same has happened and looks bad close up, I have washed and dried car but can't shift the rusting dust.

Has anyone had this problem, and can anyone please help?

[V8Bart]

thanks for the reply.
will give it a go, will stick the bar up the workmans arse after I'm done (without the lube!)

[V8Bart]

Thanks for all the replys guys.
Due to budget I could not get all the products, but paint cleaner and clay did the trick. Amazing stuff.
Before:-


and After:-

[V8Bart]

BTW, thats a days work and cheating at that starting with a drive through wash
I now need a weeks recovery lol. Worth it though.

Now 5......4......3......2.......1.....and rain! lol