Detailing types, what is this and how do I kill it?

[cathalm]

Was clening my wheels yesterday and found the marks below. Deep black marks that won't shift with wheel cleaner. These wheels were spotless when I got the car a few weeks ago and haven't been left with brake dust on them for any period. What is this stuff and how to I get rid of it? Or is this some kind of damage? Some of it looks like the paint has come off or coroded (maybe) so I need help!

[mikey k]

Looks like baked on brake dust to me.
Try something like wonder wheels but only very briefly and make sure you rinse it off very well.

[bogie]

could also try the manual polishing method with a cloth and whatever polish you use on the car...maybe something with a bit of cut like a "paint cleaner" type product ...give it a rub for a few mins, see if that shifts it

...and once you get them clean, get a few coats of wheel wax or polymer sealant on there so it dosent stick again

[SimonSays]

Get a clay kit, should come right off... Maybe some APC first 1:5 or so... Rinse properly when you're done ! Then wax them

[Muzzer]

That my friend is tar and baked on brake dust. The bain of any wheel cleaner.

Use a clay bar and a tar remover as necessary and it'll come off. You may have to remove the wheels to do it properly though....