Now that you're looking at just the battery and terminals, you can clean them up.| batteryfast.com

Jan. 2, 2011 - PRLog -- This actually does work, but unless you're cleaning your battery posts on a deserted island with nothing but a supply of Coke, I'd go with a more modern (and clean) method.
Your auto parts store will have a few choices of corrosion removal fluids, and they are all pretty much the same. The Victor kit shown came with a little brush, but it was quite little.
With your battery terminals off, squirt the solution on the battery posts and terminals, especially the inside. If you have the little brush, you can "brush away stubborn build-up." It will start to foam, and let it do this for a few minutes, then rinse it off with a little water. Now install anti-corrosion discs if you're using them (see next step), re-install your terminals, positive side first, and you're back in business!

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A little note for the very money-conscious: these corrosion eating fluids are nothing but baking soda and water, so feel free to make your own!
I prefer the tried and true elbow grease method of cleaning your battery connections, which we'll discuss next.
The tried and true way to get your battery posts and terminals clean involves a wire brush and a little elbow grease. You'll need a medium-stiffness wire brush. If you can bend the bristles back and forth easily, that's medium enough. You should also wear eye protection, and maybe even a dust mask. Brushing corrosion sometimes causes it to fly around.
With the terminals off the battery posts, liberally brush all of the parts, especially the inside of the terminals, until the corrosion is gone and you are looking at clean metal. A toothbrush-sized brush makes it easier to get to the inside part.
Once they're clean, install anti-corrosion discs if you're using them (see next step), re-install the terminals, positive side first, and you're good to go!
Once you've cleaned your battery posts and terminals, you want them to stay that way. Some people swear by these little furry terminal protectors for keeping the corrosion away. I've tried them and, to my surprise, they seemed to work to some degree. I still saw corrosion on cars that were prone to it, so don't rely on them entirely.

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Using the discs is pretty self-explanatory. With the terminals removed, simply add the discs, installing the red disc on the positive post and the green on the negative.
Now re-install your battery terminals, positive first, and you're all set.

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