The best way to remove the acid residue is the soak it with a baking sode paste for 30 minutes, and wash off with warm water. With any luck the actual contacts can be sanded of with fine sandpaper, and the fuse holder can be reused. Before replacing the batteries, smear a bit of petroleum jelly on the ends. If you need to replace the whole box, you can find them at electronics stores such a RadioShack.
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The acid is at the bottom of the battery compartment. Are you suggesting that I make a paste and push it down to the bottom, then rinse with water?
How do I sand the "floor" of the battery compartment?
Can I really get a replacement at radio shack? Wouldn't I have to get a replacement part from comfort glow/desatech?