AAAH Beloved NES

Sometimes I cringe when I sell an original NES because I can tell the ppl have no idea what they are dealing with. I know they will be returning it within a week.
So what's the problem? As far as I can tell these people don't realize how to clean the carts or connectors. A real can full of contact cleaner, found at any electronics store, is the best. Some ppl use rubbing alcohol and a q-tip... cotton fibers can get under the cart teeth so I recommend looking into those sponge tip makup applicators.
NES is like having a pet... if you know just how to feed them (guiding in the cart) they love you and work for you. Each one is different. I've heard many people say "My NES works for ONLY me" *grin* That right there is half the joy of owning one of these little beasties!