If there's quite a bit, use an ink eraser which is more abrasive. 3. Precautionary measures must be taken while removing this corrosion since any contact with the acid/alkali will mean damage to your skin. Remove the batteries if you need to remove corrosion on battery contacts. I have tried to prevent this issue in the past but I still had battery corrosion build up inside of old remotes that were stored without batteries. Batteries can burst and corrode the terminals in electronic items and toys when they haven't been in use for long periods of time. Wipe off the liquefied corrosion. How to clean leaky battery corrosion from a remote. Ever wondered how to get rid of that chalky white stuff when batteries leak? The battery compartment is a mixture of red/brown rust on the "flat" end and green/white solid stuff on the "spring" end. Dry contacts completely before reinstalling fresh batteries. 2. one end is a spring, which is not so hard to get at but the other end is a flat spiral of wire, held in place by the casing so very hard to get at. Like most DIY jobs, cleaning the battery terminals on toys requires a step-by-step guide, and also some specific materials and equipment. Hi Can anyone tell me a way to remove rust from the the spring in a battery compartment of a handheld computer? Vinegar is a weak acid that will dissolve and loosen corrosion. The oil won't degrade the electrical conductivity. Use a damp cloth instead of running water and remove any leftover potassium hydroxide residue . Removing this erosion is simple and safe to do if you are cautious. Brush vinegar directly onto the corroded contacts. Next if possible, wash out the bottom of the battery holder and clean any of the old potassium hydroxide away from the case. If you can’t remove the battery holder, then you are going to have to be a lot more careful when cleaning the area. I'll try sandpaper and hot water tonight after work (wearing gloves). When done, wipe it with a light oil to inhibit further corrosion. When this is the case, I still need to remove the battery corrosion with this battery corrosion cleaner even though the batteries have been removed. If contacts are heavily rusted or damaged, you may want to use an abrasive such as sandpaper to clean to the base metal. Because many battery contacts are nickel plated, if the corrosion has eaten through this plating the contacts may be susceptible to rusting in the future. The caustic material inside the batteries can interfere with the ability to operate the toys, but with the right method, you can remove corrosion from the battery terminals and restore the toy's function. After removing the corrosion residue, which I believe you've done, Try using a pencil eraser to clean up the contact. Dip a cotton swab into white vinegar.