Your year came with a non-coated rotor according to all the facts and SC'* I've ever seen from your year. Being that the casing itself is slightly different, unless your motor was swapped, the charger shouldn't have coating on the rotors.
Everyone else is telling you they have coating, because all the superchargers had coating except 92 and 93. Most folks don't have a lot of experience with the 92 and 93 chargers. The other thing I'm saying is things happen, engines get swapped and in general terms your rotors shouldn't be coated.
Clearly though... don't ever clean rotors. It'* a bad idea. First off you will clean the grease out of the needle bearings that the rotors rely on to spin. Secondly you'll see all the coating come off like I did.
At the time the average supercharger for my car was costing over $500 used from friends. It was a bad day.