powdercoating is near permanent. the only way your truely going to get it off is if you take a screw driver and sit there and scratch at it... or curb it... you should clean your wheels a little more once their powdercoated because the salt will eat at it. i would say clean your wheels once a week. maybe every other week.
2003 Focus Sedan - Sold but not forgotten
2014 Mustang V6 - Current