The wife got this for me for my 40th bday last month. Up to this point I've only been shaving with antiques. I'm careful to dry and clean my razors after use, but until now I've kept them in the bathroom (which gets a lot of use...5 kids). The humidity has attacked my new razor and I've got a bit of rust on my Bismark.

What can I do to clean this off without destroying the gold wash on the blade?