Sorry if this is the wrong category for this question, but I thought I might reach some knowledgeable people here:

I just bought a great Craftsman cabinet over the weekend, and I'm not sure what type of cleaner to use on it. I'm almost certain that the finish is original. I believe the wood is walnut, and it has been stained a medium oak. It looks like it has only one thin coat of finish, to keep the grain of the wood readily apparent.

I used Murphy's Oil Soap on a white rag to clean a tiny area of the cabinet at first, and I noticed an orange-y color rubbing off onto the white rag. Unfortunately, I can't tell if it's the finish coming off or if it's old tobacco stains, so I stopped cleaning it. What would be safe to use on it? I'm not looking to shine and polish it up - I just clean and free of all the fingerprints it has on it from being at the antiques center.

Thanks!