How to clean a Game Boy Cartridge

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How to clean a Game Boy Cartridge: crwdns2935265:00crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

How to clean a Game Boy Cartridge: crwdns2935265:00crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Apply some air into the cartridge bottom and into the cartridge reader itself.
Reinsert cartridge and try again.
If problem still persists, an internal problem may be the culprit.

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