I also do the old shade-tree mechanic's baking soda thing. Been doing it with my vehicles, boats, etc., since I was a teenager. Mix about a heaping table spoon full in maybe 12 oz of water in an old drink bottle, then pour it over and around the batteries. It will foam up where ever it finds traces of corrosion and/or battery acid residue. Let it sit for maybe 5 min. then hose off. I also keep a coating of dielectric grease on the terminals and cable connections to help control corrosion. I only have to do this twice a year to keep everything clean and corrosion free.
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