6 year necro bump of a thread from 2003 and I have to mention this since it worked well for me even though it's not quite a liquid until you water it down, it's more of a paste:
QuikGlo for Heavily Corroded Contacts. QuikGlo is a Cleaner and Polisher all in one that I saw on Jay Leno's Garage for metal in general. It feels pretty coarse, it won't flow onto a Q Tip easily unless you water it down and I admit I've scratched a toilet handle with it so it's not the gentlest cleaner. I've used QuikGlo on Brass that was Blue and it turned back to Brass color easily.
Recently, I purchased some Genesis games and 4 wouldn't work; the old Rubbing Alcohol and Q Tip trick wasn't working after many tries (This isn't 2006 anymore, corrosion may be more severe now) but watered down QuikGlo did work for 2 of 4 non working games. I'm still out on the other 2 but it cleaned the contacts very well where Rubbing Alcohol wasn't cutting through the corrosion. It also stripped the original gold plating off but personally, I don't care about that so much when I'm trying to get the game to work.
QuikGlo costs about $15 for an 8 Oz container but you'll be keeping it for a long while if you're only going to use it on stubborn games. Also (as they note in the Jay Leno's Garage video below,) if QuikGlo gets hard then you just wet it a bit and mix it; good as new.
https://youtu.be/v7TnNEBy3tI
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