How do I get rid of the green crud on brass, without losing the patina

[Jim Curlee]

I have a couple of older guns; they have that green crud that builds up on unpolished brass.

Other than pickin it off, is there a way to get rid of the crud without losing the patina of old brass?

Jim
 

[rich pierce]

The green crud is the best kind of patina. A toothbrush used in several random directions, wetted with detergent water, will reduce the fur. Anything chemical or more aggressive mechanically will affect all the patina, in my experience.

[Jennison]

I’ve had luck with a q-tip and 91% rubbing alcohol.  Try it in an inconspicuous spot first.