Originally Posted by
Oldskool
As crazy as it may sound, I use the security bit, take the cartridge apart. Then use toothpaste and a toothbrush on the contacts. First I use straight toothpaste by rubbing it in with my fingers until the toothpaste turns dark. Then I wet the toothbrush and start brushing away at it. After I feel it has been cleaned off well I rinse the contacts off and brush until the suds go away. Finally I polish it off with a cotton towel. You'd be amazed how clean it gets. And toothpaste is always around and cheap.