Stanley Mitre Box No. 358

I recently picked up an antique Stanley Mitre Box no. 358 with an Atkins back saw from a friend at work.  It used to belong to his dad and he found it in a shelf in his garage a couple of months ago.  I think that this thing is really, really neat and I plan on cleaning it up and trying it out.  Does anybody out there know of a good cleaner that I can use on this with out messing up the patina?  I want it functional and clean looking but I don't want to lose any of it's rustic charm.