I believe this is due to chemical reaction between the brake cleaner and the metal. A light dish washing detergent, water, and nylon brush will get take care of it.
AND... do not use it on a glock, or it'll do the same thing to that tenifer finish.
"It is only the warrior who chooses pacifism. All others are condemned to it."
"Malo periculosam, libertatem quam quietam servitutem." Dangerous Freedom over Peaceful Slavery.
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