I don't normally use anything. Keep the acid cleaned off the top of the battery and it won't corrode the terminals. If the battery is leaking and won't stop, check the charging system, it may be overcharging. If it's not..... replace the battery. If you must use something, grease works. So does the battery terminal protector sold in aerosol cans at part stores. I keep some from Napa around if I need to use some.
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