The guy thats organizing the event. Pete Calabrese.
And I quote
It is IMPERATIVE that all the contacts are cleaned perfectly, BOTH top and bottom. Use a craft knife, paper clip, or awl to clean these contacts. After you have scraped way most of the coating, you can use a piece of emery cloth, or scotch pad even more, clean until you see COPPER and do not go any further or PCM damage will occur. Clean one contact at a time and do not go across the contacts. Once you get down to the copper, clean the contacts with a clean, lint free cloth soaked in rubbing alcohol.
EDIT how can I tell that it works? I'm pretty sure Pete's getting his directions from Jerry from SCT tuning.