I have a 1911 Colt that was made in 11/1917. The gun was not loved, it spent may years locked up in a bag and forgotten. One of the owners looked like he had huge sweaty hands because there are finger print stains on it now. He obviously knew nothing about wiping off a gun. My question is, is there any way to clean the surface with out taking off that nice 96 YO bluing. Even if I could just knock down the yuck 10% it would look a lot better. Any advice?