I did as Michael suggested last year. Skier's Choice was great about sending me out some new material ASAP. However, after a month or so the new material started tracking black residue as well. The issue is that UV rays are breaking down the material which causes it to come off on your feet. The material is sprayed with a UV inhibitor on the surface during manufacturing. However, much like sun screen, the UV inhibitor dissipates after a period of time allowing the material to break down.
I replaced material on my platform a second time, but this time I used Hydroturf which has a UV inhibitor blended in the actual material as opposed to being sprayed on top. So far I have had zero residue tracking. Unless Skier's Choice now has a new material that won't break down I would suggest going a different route (Hydroturf or Seadek).