Help! Battery Acid Overflow

[MO_CPA]

Hey all,

I took the cover off of the Tracker today to see how things went over the winter. Everything was in pretty good shape...BUT when I opened the battery compartment, I noticed that there was quite a good bit of acid (white corrosion) on the aluminum in the battery area. I took the batteries out in October/November so I am not sure why it is just now showing up. So, I am freaked out a little and need your advice:

1. What is the possible effect on the aluminum that is covered in the acid? Will this ruin it?
2. Is there anyway to neutralize the acid? I have heard a mix of baking soda/water as well as a professional product. What would you use?
3. What is the best way to take care of this going forward? Should I install a sealed battery box, cover the bay area with a thick plastic sheeting and change it out every year, or switch battery types?

As always, I appreciate your knowledge! I hope I haven't f'd....er....*messed* anything up.

John