I could try a number of things; throw a little baking soda on them and put some vinegar in a spray bottle, let it sit there and do whatever it does for a few minutes, and wash it off. You could get some Ajax or Bar Keeper's Friend and put some elbow grease into it with a brush. You could always order some battery cleaner from a golf cart site, but I think one of the former would be just as good. :)
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