Your battery terminals should be cleaned whenever you start to get corrosion. The battery acid that is causing the corrosion is damaging to your battery terminals and to the battery cables. If these are not cleaned it can cause damage to the terminals which can shorten the life of your battery. It will also cause damage to the battery cables, and even to your wiring harness. These would then need to be replaced. When your battery corrosion gets bad it can cause a no start issue.
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Happy Adventures,
Heather