Soak in a mild acid such as vinegar or citric acid. Afterword rinse the coat with WD-40.
It is possible to buy some nice new battery contacts now too. I did a video recently about this after a friend gave me a tip about the new contacts being available from Aliexpress. https://youtu.be/HwqvUbz0vPY Jeff Birt From: M100 <[email protected]> On Behalf Of Francois Gurin Sent: Monday, October 18, 2021 10:45 AM To: [email protected] Subject: [M100] corroded battery contacts Hi All, This isn't specifically an m100 question, but is one that relates and I'm sure people here will have experience with this. I have an Amstrad NC-200 with severely corroded battery terminals. When it's just battery leakage, I have always had good luck with contact cleaner (I use WD-40 brand contact cleaner and a toothbrush for cleaning pretty much everything, it's a lot easier for me to work with that the various deoxits and other brands) and on extreme cases help from a knife or some steel wool. Contact cleaner isn't doing much, and it's very resistant to scraping. I have a feeling this is straight up rust which I (knock on wood) don't have much experience with on electronics or a combination of both battery leakage and rust. Short of fully replacing the terminals, any ideas on how to clean up these terminals? --fg
