Cleaning NES Cartridges Step by Step

Step 1: Gathering the Necessary Cleaning Supplies The first step in cleaning NES cartridges is to gather all the necessary supplies. This not only saves time but also prevents haphazard movements that may damage the

Written by: Mateo Costa

Published on: March 12, 2026

Step 1: Gathering the Necessary Cleaning Supplies

The first step in cleaning NES cartridges is to gather all the necessary supplies. This not only saves time but also prevents haphazard movements that may damage the cartridges. The essential tools include a 3.8mm gamebit screwdriver for opening up the cartridge, a clean cloth or lint-free wipes, a soft toothbrush, and 99% isopropyl alcohol. These tools are significant because the alcohol attracts dirt and debris, the toothbrush is useful for scrubbing, and the cloth is used to wipe off the alcohol and grime. The screwdriver, on the other hand, is essential and specifically made for opening retro gaming cartridges.

Step 2: Properly Opening the NES Cartridge

Having gathered the necessary tools, the second step involves opening the NES cartridge. With your gamebit screwdriver, remove the screws at the bottom of the cartridge. Carefully remove the PCB (Printed Circuit Board) from the cartridge shell, ensuring you note which way the PCB was oriented in the case. It’s generally advisable not to disassemble more than one cartridge at a time to prevent mix-up.

Step 3: Cleaning the Cartridge Exterior

Begin with cleaning the cartridge exterior. Even though it might seem unnecessary, it’s crucial to avoid recontaminating the internal pins upon reassembly. Use a clean lint-free cloth dampened with isopropyl alcohol to gently scrub the outer shell. The isopropyl alcohol helps to dislodge grime and constant rubbing with the cloth lifts the dirt away. Repeat this process, patiently working your way across the entire exterior of the cartridge until it’s entirely free of visible dirt.

Step 4: Cleaning the Cartridge Contacts

Moving on to the most important part, the cartridge contacts, soak a portion of your lint-free cloth in isopropyl alcohol and fold it around the head of your toothbrush. Gently scrub the contacts on the PCB using an up and down motion. Do not brush side to side as this can potentially cause damage to the contacts. The alcohol aids in lifting trapped dirt, while the bristles help clear off stubborn stains and persistence debris.

Step 5: Check the Cartridge Contacts for Residue

After scrubbing the contacts, it’s time to inspect your work. Hold the cartridge contacts up to a light source. If you notice any form of residue, repeat the cleaning process until they are gleaming and free of any gunk. However, extreme care should be taken to avoid scrubbing too hard, as this can cause irreversible damage to the contacts.

Step 6: Drying the NES Cartridge

After intense scrubbing and removal of debris, the cleaned contacts need to be dried. The highest degree of purity isopropyl alcohol dries pretty quickly on its own. Nevertheless, remove any remaining dampness with a dry, lint-free cloth. Ensure the contacts are perfectly dry because dampness might affect the functioning of the cartridge.

Step 7: Reassembling the NES Cartridge

Once the contacts are dry, it’s time for reassembling the cartridge. Carefully place the PCB back inside the cartridge shell in the same orientation as it was before, ensuring it fits into the designated slots. After this, you can go ahead and screw it back together using the 3.8mm gamebit screwdriver.

Step 8: Testing the NES Cartridge

The final step after cleaning is to test the NES cartridge to ensure that the cleaning was effective. Plug it into your NES console and try to play a game. The game should load flawlessly, without the infamous ‘flashing red light’ error sign on the console. If it doesn’t play the first time, you might need to repeat the cleaning process. If the problem persists, the cartridge might be damaged.

By following these detailed steps, gamers can furbish their NES cartridges, preserving not only the games but also the gaming history and cultural significance bound in those cartridges. By cleaning the cartridges carefully and efficiently, you can enhance their lifespan and quality, resulting in an improved gaming experience.

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