You can use a baking soda solution and a wire brush. If there's any severe corrosion to the terminal ends or the cables, consider repair or replacement by a mechanic. Otherwise, let the area dry before moving onto the next step.
 Place the new battery where you just took the old battery out, with the positive and negative terminals on the correct sides. Connect all the screws, clamps or bars that may hold the battery in place.
 Tighten the clamps using a wrench.
 Tighten the clamp with the wrench.
 Spray the terminals with lithium grease to prevent corrosion.
 Shut the hood of your car firmly and start your car. Check that all the electronic devices are working properly. Remove any battery memory saver that was installed to save the radio memory.
Clean the terminal clamps and the battery tray.
Replace the battery.
Reconnect the positive terminal'.
Reconnect the negative terminal.
Apply battery lithium grease.
Close the hood.
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