to remove carbon you will need to hone the bore and replace the rings (doing it properly) and then u need to run it in again to build up carbon on the rings to get a good seal .
so the question is do u want to clean or rebuild ???
With a Nikasil (sp) coated bore you do not need to hone when replacing the rings.
If the rings are stuck and removed for cleaning, just remember to put them back the exact way they came off.