You keep your car running by doing preventive maintenance, including changing the oil regularly and checking all the fluids. But one area you may not pay attention to is your car’s battery. A car battery is a hot bed for corrosion. The acid in the battery escapes from the device and builds up on the battery terminals over time. There is an inexpensive method to prevent battery terminal corrosion–applying petroleum jelly to each of the battery terminals.
An inexpensive way to keep corrosion from building up on your car’s battery terminals is to apply a tablespoon of petroleum jelly to both the positive and negative posts. Use a wrench to remove the battery cables from the posts, and rub the petroleum jelly onto each terminal. Wear latex gloves to keep your hands from getting greasy. Install the positive (red) cable first, then the negative (black) cable when you are reconnecting the battery.