Battery Cleaning
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Remove corrosion with a stiff wire brush.
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Wash the terminals and tops of the batteries with a solution of one tablespoon baking soda and one cup water. Rinse well with tap water and dry off with clean shop towels.
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Make sure battery terminals are tight. Use an insulated wrench to tighten as needed.
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Allow battery terminals to dry, then coat the terminals with dielectric grease or petroleum jelly, or spray them with battery anti-corrosion spray.