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Baking Soda and water work well. When all the cruddy stuff comes off dry with a Q Tip.
If you can't remove all the corrosion use nail file boards, or sometimes a pencil eraser will shine the metal up.
Also invest in some corrosion inhibitor.
Dats about all I got pardner.
Best wishes, Bill
One other thing, change battery brands. Ya might be able to get a new GPS if ya sue the company that manufactured the batteries, but I doubt it.
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