Alcohol will not remove the tarnish on the brass pins in the console. A paper fingernail file

Up & down back & forth 1 time. Have 500 consoles in store. 8 1/2 years never had a cartridge system ever come back toy store. Takes 5 seconds & cost a nickel.

All you need is a slightly worn paper fingernail file. Up & down. Back and forth 1 time. In 6 1/2 years I've never had a console come back to my store. 500 consoles & 10,000 games.