Mix 1 tablespoon (15 ml) of baking soda with 1 cup (250 ml) of very hot water. dip an old toothbrush into the mixture and scrub the top of the battery to remove corrosion buildup. you can even dip the ends of the battery cables in hot water to dissolve any corrosion on the cable ends themselves.. Cleaning inside of car battery baking soda/water how to repair car or ups dead & old battery shortened how to repair a 12 volt battery for under 5 dollars using alum and baking soda. While baking soda is a great tool for a cleaning your home, it can also help with a corroded car battery, which may be the cause of your car troubles.instead of spending time and money at the auto shop, try using baking soda to fix your problem and help your battery live longer..
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