RickM, that is a very interesting point, I was thinking the metal wheel was so hard only the softer brake dust would be binded and rubbed away by the medium polish. BUt if they use clear coats and paint, then maybe I made the surface rougher and more able for dirt to adhere.
I am going to test for clearcoat, and look to see if dirt is more quickly adhereing to my wheel finish.
No matter which way it goes, before I compounded my wheels they were awful and a few previous applications of P21 wheel cleaner were having no effect.
I appreciate all the responses, and will fine cut polish and check the clearcoat.