My wides car for the past 5 years has had bad battery corrosion on her +cable end.
I have cleaned and replaced the terminal 3 times. I'm tired of having this issue and it causing problems for her car. What keeps causing it to return ?

Ive used coke and tried baking soda and the foam corrosion spray from autoparts store.
I get it clean enough to eat off of but within a week it starts to build back up. At times it look like s giant snow ball. Please help me out....