Brownells sells a gun parts cleaner called D'solve which works well. Brake parts cleaner or lacquer thinner are much more potent solvents than the CLP Break Free you tried, but more dangerous and flammable too. They will leave the steel completely degreased so lubrication afterwards is necessary to prevent rust. Total disassembly usually isn't necessary and runs the risk of losing parts or damaging screw heads. The case hardening is most probably there... only the colors have faded. Case hardening is only a few thousands deep but remains after the colors fade from handling and sunlight. A light buffing with Flitz or Wenol metal polish would make your shiny gun shinier, if that's what you're after. I'm sure some would recommend complete refinishing, but I personally prefer not to do that on a gun that is used but not abused. A bad refinish will destroy your Bakers' value and a really good restoration will cost more than its' value. I suppose there is some value in enjoying a gun that looks totally new though.
