Here's the Iron-X link:
http://www.autogeek.net/carpro-iron-x-cleaner.html

3D BDX makes something similar:
http://www.amazon.com/BDX-Brake-Dust-Remover-24/dp/B01BN404NY/ref=sr_1_1?s=automotive&ie=UTF8&qid=1462295309&sr=1-1&keywords=3d+bdx

In a pinch, DUB wheel cleaner works (but not quite as effective as the other two):
http://www.amazon.com/DUB-U1422-Wheel-Cleaner-oz/dp/B00G49NYT0/ref=sr_1_1?s=automotive&ie=UTF8&qid=1462295347&sr=1-1&keywords=dub+wheel+cleaner

Now, this stuff does NOT smell good, but it works well on loosening up those metal particles. Afterward, a good clay bar should get the rest. The clay will probably be toast once you're done with it, but it should do the trick