Looking for some advice using my Multi-tool and the polishing belt.. I normally get very good results bringing older irons to life as well as taking a satin finish to a bright mirror finish. Often times I end up with a black residue on the iron head that I need to hand buff off. I am using the white polishing compound (white) on the belt (MT0006). Essentially creating an additional step in the process. I also use the buffing wheel with the black compound.

Am I missing something obvious?