I found a website today... IMMD

http://itmademyday.com/

If blowing doesn'y do it, then try just a little licking

Some of the N64 games we have just didn't want to work. Tony Hawk, Zelda, Micro machines, Superman... MOST of them didn't want to work.

Standard Nintendo Legend & Lore (tradition) is that you should just blow in to the cartridge to make them work again, but alas it did not work :(

However, licking the computer-chipy part of the cartridge? THAT has done the trick!