Quote:
will carb cleaner harm the blueing?
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You would probably be okay with using it but rather than take a chance, I'd step down to Brake-Cleaner. Also would suggest the small test area that
g.willikers , suggests. ....
Whenever I run into dirty areas like this. I break out my Tornados. Soak the bad areas with Hoppes #9, over time and then let the Tornado do it's thing ....
Good Luck and;
Be Safe !!!