So the other day, I was able to find five NES carts at a garage sale. Not surprisingly, they were in really bad shape. I have given a cleaning session to four of the games (fifth has yet to be started), and two games have a rather bad issue. While they'll play, the corrosion on the contacts results in them having slightly glitchy graphics. I've given them a long run with Brasso and alcohol, yet the corrosion is still there.
I've done some reading, and I've found some different solutions: electronic cleaner, very fine grit sandpaper, or solder.
I am NOT using sandpaper, soldering is something I have no experience with (and warned it's not a permanent solution and could negatively be affected from the remaining gold pins), but the electronic cleaner doesn't seem to get the corrosion off.
Is it a hopeless cause, or can anyone reading this give me advice?
I'm veering toward the cleaner, but as stated above, it's not working as well as I hoped. Or should I be patient with the cleaner?