Carts/connector cleaning

Hello, time for the yearly nostalgia. I have quite a collection of NES stuff (carts and consoles) that I've rescued from trash, garage sales, etc. that has been sitting in my basement for a few years. Trying to run one of the games produces odd output (i.e. lines down it display, not booting entirely) which I know is due to dirty contacts. What's the best way to clean these? Alchohol on a swab? Freon? (I have a friend that bought out a very large supply of it just before it became illegal to sell (i.e.: 100+ bottles for his reel-to-reel tape recorders) Kevin ------------------------------------------------------------------------------- "It's you isn't it? THE BASTARD OPERATOR FROM HELL!" "In the flesh, on the phone and in your account..." -- BOFH #3