From personal experience the blowing into the cartridge method appears to work like magic. Even after cleaning the pins with a q tip and rubbing alcohol a good blow on the pins seems to be the spark back to life that the game needs. I decided to do some research to see what others say about this topic and if anyone had any evidence to back it up.A couple tests have been done where one cartridge was blown on multiple times and one was not blown on at all. Over time the cartridge that was blown on developed a light film over the pins and the one that was not blown on looked to be the same. However they both worked whether they were blown on or not. This study was only done over a few months and the effects could be worse over a longer period. In theend blowing on the pins does have some kind of effect on pins morenegative than positive.