Mink Oil's OK. Personally, I don't like neatsfoot oil either. I use an Australian stuff by Oakwood - nice smell of eucalyptus, and is really penetrative. Or there's Hooper's Saddle Food. I'm not sure if Weaver's in Mount Hope Ohio do it, but they do a wide range of mail order leather stuff.

And as people have said, use saddle soap to clean the leather.

The difference between belts and clothing is usually that belts are still made from bridle leather (or some approximation to it), which is vegetable tanned, whereas clothing/upholstery leather is usually chrome/chemical tanned and thus more water resistant.