It's not uncommon for aluminum to form a white oxidation layer. It really doesn't hurt anything unless it gets pretty thick.
To clean it off, you started off right by cleaning it with dish soap. Now take a lemon, cut it in half and dip it in a little salt, and gently scrub the fins. You can also use lemon juice on a rag to clean the fins. You can also use vinegar, but most people like lemons better.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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