I don't own one, but i would think that a good rinse and then star sans would be good enough.
EDIT: Read CFC as immersion chiller for some reason. What I wrote is not relevant.
I would imagine though that you could cap one end and fill the CFC with a PBW solution, let it sit overnight, then run hot water through the lines until clean. Depending on whether your design is curved or uses hard angles (I've seen some with tight angles) and how long the lines are, you could run a brush on a line or flexible fibreglass rod through it.
Originally Posted By scrum:
For cleaning I can usually just rinse/brush it off, but sometimes I drop it into a brew pot with a little PBW to ensure it's clean.
I use starsan for sanitation, but I also just let it boil with the wort for a while before chilling to be double sure.
I'm talking about counterflow chillers, not immersion chillers.
I would flush the star-san out as it could corrode the copper. i just flush mine and thats it, copper has natural antimicrobial properties