The Best Way To Clean Your NES Cartridges
When I first started out playing my new-to-me NES, I would just pop a game in and… it didn’t always work. I know you always see people blowing into their cartridges, but I had heard that was a bad idea. So what is the right way to get a game working properly?What’s the best way to clean NES cartridges so they consistently work? Do a deep cleaning on your game carts, opening them up for full access to the board, so you can fully remove anything from the contacts. It’s easy to learn how. My carts all work 100%, every time I put them in.Reading: how to clean nes gamesWhen you insert a cartridge into your NES, the circuit board in the cartridge needs to fully connect with the 72-pin connector slot inside the NES console. If this connection point isn’t in optimal shape, your games will work only inconsistently, or maybe not at all. So, to make your NES setup work consistently every time, You need to cover two areas:
This article is about point #1. If you haven’t sorted out #2 by replacing or rehabbing your NES console’s 72-pin connector, you’ll want to read up on that.Bonus tip: It’s always a rush to get a new game, and I know I get excited to try it out ASAP. BUT – once you have your 72-pin connector sorted out, it’s best to follow quarantine procedures, and not insert any cartridges that haven’t at least been through Level 1 cleaning below. If you put a funky, uncleaned cart into a nice clean 72-pin connector in your NES, you can transfer problems from the cart to the connector. Don’t do it! At least do a Level 1 cleaning below before you put a game into your system.
The Best Care for 30 Year Old Game Cartridges
Contents
NES game carts are artifacts from a good 30 years ago. They have three decades of history. If you get a game from a friend, a yard sale, even a store – assume you have no idea what it has been through, and that it has not been properly cleaned.

NES Cartridge Cleaning: Level 1 – A Bare Minimum
Don’t put anything into your NES unless you have at least done this much. Really. It’s so easy, and can save you frustration from an unknown cart (even one that looks good to the eye) gunking your system.
You Will Need
- Cotton swabs, the kind with the paper/cardboard shafts, like Q-Tips
 - 91% isopropyl alcohol
 
I prefer the swabs with paper shafts because the plastic ones often don’t hold the swab part during serious use.High-purity isopropyl alcohol is recommended for the cleaning of electronic contacts. Computer techs use it to clean the contacts on expansion boards like graphics cards, which are essentially the same thing as your game cartridge’s contacts. Get 91% isopropyl. You may have to look a bit to find it. I got mine at Walmart. Don’t go for the more common 70% rubbing alcohol, since higher purity is better. Lower percentage can give non-optimal results.The NES cartridges say right on them not to use alcohol to clean them. The reason seems to be that they wanted you to buy their cleaning kit – which of course used alcohol. Go figure.Read more: how to mount camera on motorcycle helmetSaturate an end of a swab with the 91% isopropyl alcohol. Holding the cartridge firmly in one hand, insert the wet end of the swab into the cartridge mouth, all the way to the back. Now bring it up against the contact pins on one side of the bit of circuit board that is in the cartridge mouth. Firmly, and vigorously rub the swab back and forth – in small areas, then end-to-end, making sure you have rubbed the whole side thoroughly. Turn the swab a little every so often to expose clean cotton to the contact pins. Keep going until you can rub a clean portion of swab vigorously across the contacts end-to-end and pull it away without the slightest tinge of dirt (really, oxidation, usually).Once you have cleaned one side of the contacts, start with the fresh swab end, and repeat the process on the contact pins on the other side. It often takes me 2-3 swab ends to get the contacts on both sides cleaned completely. I rub vigorously enough that the paper shafts often end up bent. Don’t be ginger with it. Really rub.Once the contacts are clean, I like to take the spent ends and run them around the inside of the cartridge mouth to wipe out any dust, dirt, etc that might be around.
NES Cartridge Cleaning: Level 2 – Open Case For Better Contact Access
I do this for all of my games. The reason is because I had thoroughly done Level 1 on all my carts, and then I replaced my 72-pin connector, but the new connector didn’t make all of my games run every time I put them in. I got more serious, and did this Level 2 cleaning on all my games, and now every one of my NES cartridges comes right up every time I put it in the system.
You Will Need
- 3.8mm Game Bit, or “Nintendo Tri-Wing” Screwdriver (or small flat head for some carts)
 - Clean pencil eraser
 
You will need a special Nintendo style screwdriver to open your cartridge. It comes in handy as you work on making sure your games are properly clean. You can buy a single screwdriver, a tip for a replaceable tip screwdriver, or I bought this little kit on Amazon, which gave me a 3.8mm screwdriver for NES/SNES cartridges, a 4.5mm screwdriver for various Nintendo and Sega system consoles, and several other tools with specialized tips for use on electronics.




NES Cartridge Cleaning: Level 3 – More Serious
If a thorough (you really have to rub that eraser like you MEAN it) Level 2 cleaning doesn’t get your game going consistently (and you see no obvious corrosion/rust on the contacts) then it’s time to up your game. Start Level 3 with an open cartridge like you did in Level 2. Look closely to see that there aren’t other visible issues, like broken/corroded traces (the light lines going from the contact pins to the chip pins on the board). If there are not, then it’s time to try cleaning the contacts with something a bit more aggressive.
You Can Try
- Electronic contact cleaner
 - Baking soda
 - A melamine sponge – aka Magic Eraser sponge
 
Since we’re cleaning electronic contacts, dedicated electronic contact cleaner products are a good thing to try. They come in an aerosol can, with an applicator straw. Spray some on, let it sit briefly, then rub it off with cotton swabs. You want to make sure what you use is plastic safe. CRC makes an economical contact cleaner you can find on Amazon. CAIG makes a more premium, highly respected product called DeoxIT that’s also on Amazon.To use baking soda, create a paste with water, and apply to the contacts. Scrub with paper towel, cotton swab, or a new tooth brush. Be sure to thoroughly clean off all paste and residue, and then do a Level 1 91% isopropyl and cotton swab finish. Be sure to let this dry a while before trying it again, since this involves water.When using a melamine sponge, select a clean end, and either leave dry, or dampen lightly before vigorously scrubbing the contacts. Finish with 91% isopropyl and a cotton swab, and let dry for a while before testing because this uses water (assuming you used the water option). You can get a package of generic melamine sponges on Amazon. I had already had sponges around the house, because they are a great way to clean a turntable stylus, as well.These last two (baking soda and melamine sponge) are more abrasive, but still relatively mild in the universe of possibilities.
NES Cartridge Cleaning: Level 4 – Getting Medieval
DO NOT jump to this step just because you think you want to get your stuff as clean as possible. Really, Level 2 should be sufficient for most cartridges, and the stubborn ones should be good with Level 3. This level is only when the only other option is to throw the cartridge away. Yeah, I know some people are quick to use metal polish on their contacts, but you really should try everything else before this.Worth noting: Ammonia-based polishes break down the brass in the contacts at a molecular level. This can save an otherwise dead cart, but use with caution!
You Can Try
- Brite Boy metal polish
 - Brasso metal polish
 - Other metal polish (do some research)
 
All metal polishes work by removing a thin surface layer of metal. This should not be used more than maybe once! Brasso is what a lot of people use as their go-to. It leaves a residue, though. If you use it, be SURE to get all of the residue off, so it doesn’t continue to eat your contacts, and by transference – the pins in your NES 72-pin connector!. I read a comment from an electronics expert who said that after cleaning a game cart with Brasso, then inserting/removing several times from his system, he could smell the Brasso on the slot pins in his console. That doesn’t sound good to me.I list Brite Boy first in the list above, because while still a metal polish, it is more favored now by those in the know, because it does not leave the residue Brasso does. You should still finish off with 91% isopropyl. Brite Boy can be purchased on Amazon as well (this is nice, because it used to be only 3rd party sellers, with high shipping prices).I am convinced that other metal polishes might offer better options, or better prices, but have not yet dug in to call manufacturers and do the research. If you are the curious type, do some calling around. You might find something worth using.Read more: how to get software updates on unlocked phone
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