Use A Base Material To Neutralize The Acid
I'm not certain that any damage to the concrete done by the battery acid can be corrected. But using a base chemical like a heavy baking soda and water or ammonia mixture on the affected spots might help. If after applying a base the acid stains are still there, they may be permanent.
The key to avoiding battery acid overflow is to never overfill your batteries. More importantly, never fill them just before charging them. That sequence will often result in a "boiling over" of battery acid. The best time to fill batteries is in the morning after the batteries have been fully charged overnight.
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Politicians are like diapers--they should be changed frequently, and for the same reason.
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