How to Clean Game Cartridges Safely
A cartridge that flickers, freezes, or refuses to boot almost always has one problem: dirty contacts. Thirty years of oxidation and grime come off in minutes with supplies you may already own — and without the folk remedies that slowly destroy your games.
First: Don't Blow Into It
The classic fix from every 90s living room is the one thing you should never do. Breath is warm and humid — moisture on the exposed copper contacts accelerates the very corrosion that stops cartridges reading in the first place. If blowing ever "worked", it was the reseating of the cartridge that did it, not the air.
What You Need
- Isopropyl alcohol (IPA), 90% or higher — lower concentrations contain more water
- Cotton swabs
- A microfibre or lint-free cloth
- Optional, for deep cleans: a 3.8mm or 4.5mm security "gamebit" screwdriver to open Nintendo/Sega shells
- Optional: a soft brush or compressed air for dust inside the shell
That's the whole list. IPA evaporates fast, leaves no residue, and is safe on contacts, boards, and shell plastic.
Cleaning the Contacts
Dampen a swab with IPA
Wet, not dripping — excess liquid can wick up into the cartridge. Squeeze the swab against the bottle rim to shed the surplus.
Scrub the contacts on both sides
Insert the swab into the cartridge slot and rub firmly up and down along the copper edge connector — front and back. Expect the swab to come out grey or black; that's decades of oxide and dirt.
Repeat with fresh swabs until they come out clean
A badly oxidised cart can take four or five passes. Stop when a fresh swab stays white.
Dry pass, then let it sit
Run a dry swab over the contacts to pick up any residue, then give the cartridge a few minutes to air-dry completely before inserting it into a console.
Deep Cleaning: Opening the Shell
For carts that were stored badly — basement finds, smoke exposure, visible grime inside — open the shell with the appropriate security bit and clean properly:
- Wipe the board's edge connector directly with IPA swabs on both sides
- Brush or blow dust out of the shell halves; wash empty shells in warm soapy water and dry them fully before reassembly
- Clean label-free shell surfaces with a barely-damp cloth — keep moisture away from paper labels
- Inspect the board while you're in there: it's the best moment to verify authenticity too
While the cart is open, you'll also see the tell-tale signs of a reproduction if there are any — our guide to spotting fakes covers what a genuine board looks like.
What to Avoid
- Brasso, metal polishes, and abrasives — they strip the thin plating off contacts. A shiny connector that no longer reads is worse than a dull one that does.
- Sandpaper or fibreglass pens — same problem, faster.
- Pencil erasers — a popular tip, but eraser rubber is mildly abrasive and leaves residue in the slot. IPA does the job without the wear.
- Household cleaners (Windex, vinegar, acetone) — they attack plastics, labels, and plating.
- Soaking assembled cartridges — water reaches the board and label. Only bare shells should ever see water.
- WD-40 or contact "lubricants" — they leave a film that attracts more dirt.
Discs, While We're At It
For CD-era games: wipe with a microfibre cloth in straight lines from the centre hub outward, never in circles — circular wipes create scratches that follow the data track and are harder for the laser to correct. Light scratches on the read side are usually recoverable; damage to the label side (where the data layer actually lives on a CD) is not.
Storage: Stay Clean Longer
- Store carts in dust covers, sleeves, or boxes — dust on the shelf becomes grime in the slot
- Keep games out of direct sunlight (labels fade) and away from damp rooms (contacts corrode)
- Insert and remove carts straight, not at an angle — bent console pins cause the same symptoms as dirty contacts
Track Condition as You Go
Cleaning day is the perfect time to audit your shelf. As you work through each cartridge, record what you actually have on Retrollect — condition, completeness, and which copies still need attention.