The best way to remove battery leakage and clean up the corrosion from your device is to neutralize by carefully dabbing with a few drops of a mild acid like white vinegar or lemon juice using an old toothbrush.
You just need to take your time, work at it and you should see it fizzing which is a sign that it is working.
You may not get a perfect finished as the corrosion might be very bad but you will still get a good result.
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