What ol777gunmner said, Flitz is a cleaning polish that will shine both the nickel and the worn area's so that they will blend together. For just light cleaning Breakfree has always done great for me. One or two drops of Breakfree as lubricant down inside the cocked hammer, then work the hammer several times. Then about 1 drop on the cylinder shaft then replace the cylinder and spin it to make sure it is nice and free. ( Make sure you remove the cylinder correctly, holding the top latch up and away from the cylinder when removing or replacing.) When it's cleaned and lubed, Renaissance Wax it great for keeping the nickel bright and any rust from starting. Or, a very light coating of a good auto wax.

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H Richard
SWCA1967 SWHF244