Not sure how it would react to the guns and the wood and stuff, but if you want to stay away from chemicals, vinegar is an awesome fungus remover.
Put it in a spray bottle and go to town. Not sure how the blue or the wood finish would react to vinegar though, but it should be great for the inside of the safe, as long as you let it air out.
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"The Parker gun was the first and the greatest ever." Theophilus Nash Buckingham
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