You need to first try to clean the contacts on the cartridge it's self. I suggest getting a small stainless steel brush and gently scrub the contacts up and down. If you don't or can't get the brush, take a red rubber pencil eraser and use it to scrub the contacts. after you have cleaned the contacts, get a cotton swab and isoprophyl alcohol (preferably 80% or higher concentration) and go over the cartridge contacts for the final cleaning. If this fails, the cartridge has gone bad.
Never use nail polish remover on a game cartridge. There is a good chance of melting the plastic and ruining the cartridge.
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