Cleaning Copper Contacts?

[Martin Scott Goldberg]

Hey guys, any advice apperciated.  Recently picked up an Odyssey game
system, and the contacts on the game cards (basicly big jumpers)
that came with it appear to have begun corroding and forming greenish and
white deposits.

My concern is I don't want to use any sort of cleaner that will harm
whatever material the surrounding pcb is made of (as it appears to be made
out of an older, thicker material than most modern PCB's I see).


Thanks!



Marty


P.S. - I also have another side project I'm working on.  Does anyone have
any suggestions on what grain sandpaper to use for sanding plastic
consumer device cases (old game consoles, personal computers) for
painting/restoring?