If its a Jackhammer, Hell Razor, or Sarsquatch it will have decarb, and you will need to sand it off because its easy to rust.
Try a medium grit, and then a scotch-bright pad. It would be a good idea to do under the handles as well if you know how to put the slabs back on.
The models after that didn't leave to factory with decarb. They still may have some dimples, and its a good idea to keep them oiled or waxed. Dimples can collect moisture, but they should be no problem like the models with decarb.