Practical guide · NexWave Games
Cleaning a NES or SNES cartridge: what is safe?
You insert an old cartridge and get a black screen. Try again, blow into it, perhaps use something abrasive? Stop for a moment. Cartridge contacts are delicate, and the console or cable can also be responsible for a startup problem.
Rule out simple causes
Switch off the console before removing or reinserting a cartridge. Check the video and power connections, and if possible try another game known to work. If only this game fails, inspect its cartridge and contacts. If no game starts, investigate the console and TV connection too.
Remove the cartridge and inspect its metal contact edge in good light. Look for dirt or oxidation without rubbing the contacts with your fingers. Do not blow into it: moisture in your breath can worsen the problem. Do not insert sharp objects between the contacts either. Damaged contacts are harder to repair than a little dust.
Clean gently
Nintendo's care instructions warn against alcohol, solvents and harsh cleaners on game cartridges. Start with a soft, dry, lint-free cloth on the accessible edge; do not use sandpaper or an eraser. Do not wet a cartridge or pour liquid into the console slot. If reaching the dirt requires opening the game, do not force the shell.
Reinsert the completely dry cartridge straight and test again. If it still fails, compare with another cartridge. If the same one keeps failing while other games start, ask a specialist to inspect its contacts and circuit board. With a valuable game, caution is wiser than scrubbing harder each time.
What should you check before buying?
For a used NES or SNES game, request a sharp underside photo and, if possible, a brief working demonstration. A tidy label says nothing about metal contacts. Look for corrosion, broken plastic and signs of rough previous cleaning. Compare its condition and price with a cleaner copy.
Store cartridges dry and dust-free, preferably in a protective case or box. Hold them by the plastic shell and never remove them while the console is on. These simple habits reduce how often cleaning is needed.