Anyway, I've got a NES that I want to get rid of but first I want to make sure it's working. I recently bought a loose SMB cart to test it with (I never bought any games for it) and when I played it, it was all glitchy and badly messed-up on the screen.
Any subsequent tests just result in that infuriating flashing grey screen...
So the inevitable question is...how do I go about cleaning the thing to get it working again and what should I use?
Thanks in advance

