Battery terminal corrosion prevention

My Dad, still going at 95 years young, boils the tea kettle and pours boiling water over the terminals. Rinses of the corrosion very fast , then cleans post and terminals (wire brush) Then he would place a real copper penny next to the posts with a dab of grease under them to stay in place. Corrosion would go to the penny 1st. I do all but the penny trick and spray ZEP terminal protector over them after assembly.