We've been down this road before here on LF, after 30 years in the gun smithing business, having cleaned more guns then I care to remember, the only thing to use on even the hightest quality Colts and Lugers, is very fine oil, I like "Snake Oil", and a Brillo type pad made of nickel/silver and even the hard of direct scrubbing on salt/rust blue surfaces and it will not scratch or dull the finish, can also be used with Hoppes and the like....the pad is from the Big .45 shop and available from Brownells and sold also at major gun shows.....try it.
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